CN1300767C - Methodand apparatus for guiding read/write data magnetic track by servo-data - Google Patents
Methodand apparatus for guiding read/write data magnetic track by servo-data Download PDFInfo
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- CN1300767C CN1300767C CNB031267521A CN03126752A CN1300767C CN 1300767 C CN1300767 C CN 1300767C CN B031267521 A CNB031267521 A CN B031267521A CN 03126752 A CN03126752 A CN 03126752A CN 1300767 C CN1300767 C CN 1300767C
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Abstract
The present invention relates to a method and a device for guiding a read-write data magnetic track by using servo-data. Before a magnetic disk is not installed on a drive central shaft, servo information is written on the magnetic disk in advance, and subsequently, the magnetic disk is installed on the drive central shaft. According to the servo magnetic track which is written well in advance, a series of concentric rotating virtual magnetic tracks for track seeking and tracking is defined. At the time of the operation of a driver, the concentric virtual magnetic tracks can reduce the action amplitude of an actuator, and increase the acceptable tolerance of position deviation. The preliminary writing operation of the servo information of the magnetic disk can advance the efficiency of the operation of the driver of the magnetic disk, and can also reduce the requirement for an absolute dust free room.
Description
[technical field]
The invention relates to the method and the device that utilize servo data guiding read/write data magnetic track, particularly the embedded servo disk is utilized the method and apparatus of servo data guiding read/write data magnetic track.
[background technology]
Hard disk drive is a kind of magnetic data memory storage, the data that the user creates can be carried out read-write operation.Typical hard disk drive comprises one or more disks, and disk can be around central shaft with high angular velocity (typical angular velocity is 3600rpm) rotation.Actuator arm is W head and is radially positioned at magnetic disk surface, and W head can be encoded to the data on the disc.Under desirable working environment, W head writes data that to form width be 2.5 microns narrow annular magnetic track, and this magnetic track is concentric with central shaft.Yet, in the operating process of disc driver, machinery concussion, bang and temperature variation all can cause the crooked of indivedual disks or depart from rotary middle spindle, if above situation takes place, and the actuator arm device will be positioned on the magnetic track by W head, still operate under the concentric with first front disk and central shaft, will can correctly not carry out for the read/write of data this moment.When disk its corresponding position of slipping away, will produce the new annular trace that a track with the magnetic track that had before write has overlapping.This concentric displacement is referred to as " position deviation ", when it takes place, W head wants the deviation of continuous trace location in order to avoid the new write operation of W head can cover the data that before write, briefly, if there is not existing additional information that read/write head is directed to correct track exactly on the disk, the accurate location of W head can't be realized.Realize accurate location, must the correction position deviation.It is servo-information that this additional information refers to impel servo control mechanism location in the driver element and the information of accurately locating, and it writes hard disk drive in advance before user data writes and after the driver element assembling.
About 1970, Winchester technology was released the Fixed disk that has the embedded servo system greatly.In the clean room of drive manufacturers, disk is assembled, disk is installed on the central shaft, magnetic head is installed on the driver, whole driver comprises the servo track Writing device interior, required servo-information is write by the W head of driver self, requirement to degree of accuracy is very high, and for example, the operation of write head must be to be realized by laser interferometry or the identical method of other degree of accuracy.As United States Patent (USP) the 5th, 315, provide a kind of method that makes up the servo track Writing device No. 372, this method is to utilize laser interferometry that one servo track registration arm is located.
Usually, the embedded servo data comprise a data field, and this data field is to define magnetic track; One servo bursts, the effect of this train of impulses are the reference positions of correctly arranging magnetic track; And some other zone, be used for read/write and system operation.The function of present W head by separately independently element realize that they require the difference that puts in order of read/write.United States Patent (USP) the 5th, 946 provides a kind of method that writes down the continuous servo pulse row of circumference for No. 157, and this spike train overlaps each other, and allows magnetoresistance to read head position in the linear width of a spike train.In addition, the accuracy of the write head of hard disk drive also requires to use " pusher locking device " to obtain needed degree of accuracy.In this, United States Patent (USP) the 5th, 774 provides a kind of synthetic method that has the pusher locking device of adjuster for No. 294, and the effect of this adjuster is to reduce when writing servo data, the erroneous effects that is produced by the sympathetic response of pusher locking device.
The user data fields of embedded servo data field and adjacent concentricity magnetic track is arranged in radial wedge-shaped sectors.For guaranteeing to meet the requirements of degree of accuracy, writing of servo data is excircle along disk, writes a clock magnetic track earlier.The magnetic conversion that writes clock track is divided into predetermined a few part with disk, and write and the writing of clock track information of servo-information are synchronous, and servo wedge area is to be determined by the angle that clock track produces.In this, United States Patent (USP) the 5th, 796 provides a kind of method of writing clock track No. 541, and this clock track is independently, and irrelevant with the speed of central shaft.
At present, the effect of servo track be the seventies the same, servo control mechanism is as much as possible near by the servo track write.The servo-drive system of standard can be eliminated about 90% the magnetic track error that is run into.Excessive if misplace, driver is subjected to machinery concussion or temperature change, and the position deviation compensator will be got rid of nearly 90% mistake.United States Patent (USP) the 5th, 539 provides a kind of method of design one position deviation compensator for No. 714, and this compensator can provide online real-Time Compensation to the disk dislocation.According to this method, the rule rotation of centrifugal magnetic track (magnetic track of dislocation promptly takes place) produces the one-period signal, and the hamonic function of this signal is indicated by the magnetic track eccentricity.In the swing circle of predefined disk, compensator has compiled a certain harmonic constant of giving the signal of determined number.The compensation of these coefficients or Fourier is used for to the W head actuator signal that affords redress.At United States Patent (USP) the 5th, 930, in 067, a kind of multiple-harmonic compensation method that is used for trajectory track is provided, this method on principle with United States Patent (USP) the 5th, 539, No. 714 very close, and but, the harmonic compensation of high-order has improved the degree of accuracy of compensation thereby the latter has designed more.
Whether integrated compensator in disc driver no matter, the write operation of servo-information all be a loss greatly and extremely time taking process.Be about 20 in track density, 000TPI (magnetic track/inch), data capacity are about in 2.5 cun disks of 10GB (GB), and the time of writing servo information is approximately one hour.The complicacy of above patented technology of quoting and design makes the cost of servo track recorder writing servo information on disk very high, greatly between 50,000 to 250,000 dollars.In a word, servo recorder is very expensive device, and the handling capacity of its operation is very low, and this action need carries out in a clean dustless environment, and very difficult automation mechanized operation, needs the operator that suitable level professional technology is arranged.
[summary of the invention]
The invention provides a kind of method and device that utilizes servo data guiding read/write data magnetic track.After having had servo-information on the disk, install them on the driving central shaft, W head and actuating device can be worked.This method has reduced the device operation greatly and has reduced requirement to the space cleanliness.In addition, with respect to the present employed servo track recorder that is installed on the magnetic head, this magnetic disk servo magnetic track recorder that is not installed in the driver is a simpler and cheaper mechanical hook-up of price.This recorder is relatively easy a maintenance and the automatic device of operating of suitable disk.Not hard to imagine, this recorder can move automatically, work in 24 hours of no worker monitor.The magnetic disk servo magnetic track recorder that is not installed in the driver of an excellent in design can also be inscribed a folded disk simultaneously at a high speed.
Therefore, first purpose of the present invention is to realize under the pinpoint prerequisite of data track need not to sacrifice data capacity, simplifies and improve the efficient of servo data imprinting, and reduces the imprinting expense.
Second purpose of the present invention provides a kind of method with servo data guiding read/write data magnetic track, and it is static that this method allows the actuating magnetic head of standard configuration, rather than follows the trail of the rotating centrifugal track that has position deviation through regular meeting.
Two purposes of the present invention are to realize by following technical scheme: a kind of method of utilizing servo data guiding read/write data magnetic track, one hard disk drive is provided, the servo-information and the physical track of the disk of this hard disk drive are finished writing in advance, define concentric " the virtual magnetic track " of a series of rotations with respect to the physical track of finishing writing in advance, at non-volatile burst flash memory stored an array, described array defines described virtual magnetic track according to the physical track of finishing writing in advance and the point of crossing of W head, the tracking process of disk is transformed into virtual magnetic track from physical track, and what make that magnetic head assembly follows the tracks of is virtual magnetic track rather than the physical track finished writing in advance; This method also further comprises a calibration procedure.
The step of described calibration procedure comprises:
(a) select a plurality of different radial positions on the described disk, at first enter the magnetic track inner-diameter portion whose and will write the magnetic track locking;
(b) servo track of finishing writing is latched into one of them radial position place;
(c) enable position deviation compensator;
(d) compensator obtains a position error signal;
(e) selected one guarantee from the physical track pattern to the smoothly stable conversion coefficient of changing of virtual magnetic track pattern;
(f) the record harmonic constant can obtain a large amount of harmonic waves according to harmonic constant;
(g) in virtual magnetic track scope to virtual magnetic track definition position deviation signal;
(h) detent moves to path portion in the disk, repeats to carry out next step after (b)-(g) step;
(i) transfer arm moves to the disk outer radius portion, repeats to carry out next step after (b)-(g) step;
(j) use linear interpolation to set up a chart, defined every other virtual magnetic track in the table;
(k) described table is stored in the Nonvolatile storage array;
(l) disk drive is transformed under the virtual magnetic track.
Described chart is to use linear interpolation to draw according to the harmonic constant of a plurality of radial positions acquisitions of disk.
In virtual magnetic track zone, further comprise a tracking pattern, it is goal track that described pattern is positioned at tracked virtual magnetic track, the described virtual target track location that the position calculation of the current virtual magnetic track of foundation will be sought and the distance of current virtual track location, described distance is according to the position error signal of physical target magnetic track, the position error signal of physics current track and their sine function and determine.
Described virtual magnetic track is annular magnetic track, the crosspoint array of described physical track of finishing writing in advance and W head is to obtain by the analysis of use location deviation compensator for the harmonic wave deviation compensation of the servo track of finishing writing earlier, and " internal schema principle " used in described analysis.
A kind of device that utilizes servo data guiding read/write data magnetic track, comprising: one drives central shaft; One W head; One magnetic head actuating device; One position deviation compensator; One disk; And the printed circuit board (PCB) of the described drive unit of an installation.Before described disk was not installed on the central shaft, servo-information was finished writing in advance, and had defined a series of rotations " virtual magnetic track " with one heart on disk; At non-volatile burst flash memory stored an array, described array defines described virtual magnetic track according to the physical track of finishing writing in advance and the point of crossing of W head.
The physical track of described writing information in advance is not a rotation center to drive central shaft; Described virtual magnetic track based on the physical track definition is annular magnetic track.
The physical track that described basis is finished writing in advance and the crosspoint array of W head are to obtain by the analysis of use location deviation compensator to the harmonic wave runout compensation of the physical track finished writing in advance, and " internal schema principle " used in described analysis.
The present invention need introduce in a new notion " virtual magnetic track ", and its definition is the magnetic track of being followed by W head, and this magnetic track is not the track of the storage data of reality on the disk.Virtual magnetic track is that the rotating shaft with actual disk is the imaginary annular trace in center, arranges and memory address definition " virtual " this notion of writing servo information pattern intersection point in advance by magnetic track.Because the concentric virtual magnetic track of rotation is the constant characteristic that disk has been installed, they can allow servo data to write another servo track recorder unit.Because servo data is used for the defining virtual magnetic track at first, the sleep mode that activates magnetic head finally can its degree of accuracy of verification.
The address that is used for the defining virtual magnetic track can be understood as array a: XXX.yyy, and wherein, XXX represents the servo identified code that writes in advance of particular track, and yyy represents the position deviation of intersection point, and this intersection point comes from institute's canned data in the servo pulse row.Because virtual magnetic track can guide W head, W head also can need not to follow the trail of the magnetic track of dislocation.The normal condition of magnetic-head actuator is static, follows the trail of virtual magnetic track by the next track address of loading and look for storage sequence.In fact, the stationary state of actuator is the standard of measurement of virtual magnetic track premium properties.
At first, a virtual magnetic track is respectively internal diameter (ID) part, middle footpath (MD) part and external diameter (OD) part by three radial component definition on the disk.These all are by locking a magnetic track that writes in advance and utilizing the position deviation compensator to decide the humorous wave component of position deviation motion to realize.Intermediate quantity is produced by linear interpolation method.
Compared with prior art, advantage of the present invention not only is embodied in the process of disk being inscribed servo-information, also is embodied in to install in the operation of back to driver.Just as mentioned above, the process of inscribing servo-information has been simplified, and can carry out automatically, and required servo track CD writer is than employed usually cheap a lot of now.In the course of normal operation to driver, the configuration of actuator is to reduce action as far as possible, rather than often follows the trail of the position deviation of physical track.The static state of standard means that actuator is subjected to minimum external force and acceleration, utilizes the inertia of mechanism to minimize the deviation of track.In a word, driver is to be limited by its optimum trajectory.Minimize trajector deviation and mainly be to follow track often, effectively reduce and to accept misalignment tolerances, thereby deviation leaves bigger deviation surplus in system with offset deviation.
[description of drawings]
With reference to the accompanying drawings, in conjunction with the embodiments the present invention is further described.
Fig. 1 is the typical disk vertical view of installing with the inventive method.
Fig. 2 is the workflow diagram of the hard disk drive assembling of employing usually.
Fig. 3 adopts the inventive method that the workflow diagram of magnetic head assembly is installed.
Fig. 4 is the Bode diagram of first, second and third harmonic crest of open-loop transfer function.
[embodiment]
The present invention relates to a kind of method and device that utilizes servo data guiding read/write data magnetic track.On disk, finish writing servo-information in advance, this disk is installed to defines a series of " virtual magnetic tracks " with one heart on the driving central shaft and on disk subsequently to be used for tracking and tracking.The concentric effect of virtual magnetic track and the rotary middle spindle of disk is put unlike the prior art and is can keep the magnetic head actuating device to be in still-mode when driver is operated, and in the prior art, after disk is installed on the driver, magnetic head and actuating device can constantly be followed the trail of the magnetic track deviation that produces when the servo data write operation, this magnetic track deviation be the change owing to the central shaft position cause or since the mechanical motion (for example carrying mistake, vibrations) during write operation and the non-annular that causes write and caused.The present invention has not only simplified the process of servo data write operation, has reduced the cost of servo data write operation, and has improved the tracking ability of hard disk drive.
Seeing also Fig. 1, is the vertical view that adopts the typical disk 10 of the inventive method installation.Servo-information at initialization servo data write operation stage disk central shaft 11 is positioned at magnetic disk servo magnetic track recorder.A plurality of typical servo tracks 12 are concentric annulus with this turning axle.In the disk of reality, write above 20000 such magnetic tracks.These servo tracks that write in advance are " physical track " hereinafter referred to as.Also demonstrated a plurality of embedded servo sectors 13 that typically comprise magnetic track definition information among Fig. 1, this sector and servo clock magnetic track form synchronously.There are 30 to 120 embedded servo sectors 8 sectors of only having drawn among Fig. 1 in actual disk.When disk being installed on the final disc driver, suppose that disk has obtained a new turning axle 14, this causes because of lack accurate adjustment capability in the track pitch program.In this new construction, use the inventive method and formed a series of new magnetic tracks, be called " virtual magnetic track ", it is donut with respect to new turning axle.The so virtual magnetic track 15 that only drawn among the figure, but the quantity of the quantity of virtual magnetic track 15 and physical track equates, and the quantity of per inch magnetic track (TPI) also equates.Virtual magnetic track with finish writing in advance but the servo pulse row 16a-16f that departs from the physical track of rotation center has formed a plurality of point of crossing, these point of crossing form unique address array, the form of each array is XXX.yyy.The track of virtual track address is to be the annulus at center with new turning axle 14.
Consult Fig. 2, the process flow diagram of the hard disk drive installation procedure that adopts for prior art.Although the manufacturer of disk will survey formula disk 20, the disk manufacturer can't carry out servo write operation to disk.Magnetic head assembling 21, disk installs 22, and the servo write operation 23 of disk and the steps such as encapsulation 24 of driver all are to finish in the clean room of drive manufacturers.In the outside of clean room, driver element is installed on the printed circuit board (PCB) (PCB) 25, test again 26 and the encapsulation.
Fig. 3 be adopt the inventive method to magnetic head assembly install workflow diagram.Disc drive manufacturers is tested disk 30 in its dust free room.Disc drive manufacturers or drive manufacturers are carried out servo write operation to disk earlier now, produce a free disk or a plurality of disk pack unit that is stacked 31.
Next the magnetic head assembly package program continues installing mechanism and magnetic head 32 with method well known in the prior art in the clean room of drive manufacturers, and disk 33 and the whole magnetic head assembly 34 of encapsulation finished writing in advance are installed, and withdraws from clean room then.Carry out the installation 35 of printed circuit board (PCB) (PCB) and the test 36 of device again.At last test phase, virtual magnetic track has been calibrated and defined to disk.Compare with whole test durations (needing some hrs) of device, the time that this program takies is very short, about about 1 minute.
Fundamental purpose of the present invention is that the tracking process is transformed into virtual field from physical field, and like this, magnetic head assembly is followed the tracks of is virtual magnetic track rather than the physical track finished writing in advance.Generally speaking, after disk is installed on the central shaft, can keep the position deviation of 0 to 200 inter-track.As the part of device to test program, the task of this calibration procedure is to use from the information of physical track position deviation acquisition comes the defining virtual magnetic track.Here with reference to William Messner and Marc Bodson " internal schema principle " (IMP) (" Design of Adaptive Feedforward Algorithms Using Internal ModelEquivalence; " International Journal of Adaptive Control and SignalProcessing, Vol.9,119-212 (1995)) method, in the present invention, the position deviation compensator is (with reference to United States Patent (USP) the 5th, 539, No. 714 and United States Patent (USP) the 5th, 930, No. 067) promptly use this principle.The harmonic wave that this compensator can obtain to be offset (the first, the second and third harmonic, or more) content.This IPM transfer function to the expression mode of each harmonic wave is
As s=± j ω
0The time, the value of this formula is infinitely great.Fig. 4 is that first, second and third harmonic crest of open-loop transfer function is 70Hz in frequency, the Bode diagram of 140Hz relative not penalty function during with 210Hz.
Details are as follows for the step of calibration procedure:
1. enter magnetic track internal diameter (ID) part and will write the magnetic track locking.
2. enable position deviation compensator
3. position error signal is defined as in the position deviation compensator:
PES＝PES
(physical)+1F(t)
Wherein, 1F (t) is a first harmonic offset penalty function (being similar to the sinusoidal curve of known amplitude and phase place).
4. multiplicative model to the Virtualization Mode conversion formula is:
PES＝PES
(physical)-k
1(n)cos(ω
rt)-k
2(n)sin(ω
rt)
Wherein, ω
rBe rotational frequency; T is the time;
Constant k
1And k
2The calculation formula be:
k
1(n)＝k
1(n-1)+ε1F(t)sin(ω
rt)
k
2(n)＝k
2(n-1)+ε1F(t)cos(ω
rt)
Wherein, n is the track number of disk, and conversion ratio ε is the less constant of a numerical value, and choosing of its numerical value can guarantee from the level and smooth conversion of physical track pattern to virtual magnetic track pattern.k
1And k
2The corresponding same virtual magnetic track of numerical value, the circular track that servo tracking increases, when magnetic track becomes when circular completely, the value of function 1F (t) is reduced to 0.
5. be positioned at now under the virtual magnetic track pattern, at this moment, position signalling is defined as:
PES
(virtual)＝PES
(physical)-k
1sin(ω
rt)-k
2cos(ω
rt)
6. identical method also is applicable to high-order harmonic wave.
7. actuator moves to the next position (path portion in the disk (MD)), repeats to carry out next step after the 1st to 6 step.
8. transfer arm moves to disk outer radius portion (OD), repeats to carry out next step after the 1st to 6 step again.
9. use linear interpolation legal system one form, determine the k of all magnetic tracks
1And k
2Value.Described table is stored in the Nonvolatile storage array.
10. drive and be transformed into virtual magnetic track field, and other each objects do not change." be transformed into virtual magnetic track field " in the present invention the meaning is that " physics " magnetic track 12 (as shown in Figure 1) with unique address that magnetic track defines during no longer by servo write operation defines, but by calculating the annulus around real turning axle rotation of intercept definition with the servo pulse row point of crossing of finishing writing in advance (16a-16h among Fig. 1).The form of each intercept is reduced to the combination of a track address (XXX) and a magnetic track deviate (yyy), and still, previous track address is always identical, and the magnetic track deviate is position error signal (PES).Must use physical track when the magnetic head width is calibrated in test procedure with position deviation compensation.
Details are as follows for tracking pattern (navigating to goal track from current given virtual track location): the tracking pattern, each distance is that position rub-out signal (PES) all is reference object magnetic track definition, and draws velocity across (speed of the best of using in the tracking stage and the tabulation of acceleration) based on this signal.
The strict difinition of goal track distance is as follows relatively:
PES
(goal track distance relatively)=(virtual target magnetic track)-(virtual current track).
Wherein, virtual magnetic track definition is the same:
PES
(virtual)＝PES
(physical)-k
1sin(ω
rt)-k
2cos(ω
rt)
Because it is very little that the sine function of current track is compared with distance, be the effective processing time because of what calculate use again, we will think apart from approximate:
PES
(goal track distance relatively)=(virtual target magnetic track)-(physics current track).
Just
PES
(goal track distance relatively)=PES
(virtual target magnetic track)-PES
(physics current track)
Or
PES
(goal track distance relatively)=PES
(physical target disk)-k
1Sin (ω
rT)-k
2Cos (ω
rT)-PES
(physics is worked as front disk)
The slope of physical track and virtual magnetic track is identical, so need not different slopes is revised.
Claims (8)
1. method of utilizing servo data guiding read/write data magnetic track, it is characterized in that: a hard disk drive is provided, the servo-information and the physical track of the disk of this hard disk drive are finished writing in advance, define concentric " the virtual magnetic track " of a series of rotations with respect to the physical track of finishing writing in advance, at non-volatile burst flash memory stored an array, described array defines described virtual magnetic track according to the physical track of finishing writing in advance and the point of crossing of W head, the tracking process of disk is transformed into virtual magnetic track from physical track, and what make that magnetic head assembly follows the tracks of is virtual magnetic track rather than the physical track finished writing in advance; This method also further comprises a calibration procedure.
2. the method for utilizing servo data guiding read/write data magnetic track as claimed in claim 1, it is characterized in that: the step of described calibration procedure comprises:
(a) select a plurality of different radial positions on the described disk, at first enter the magnetic track inner-diameter portion whose and will write the magnetic track locking;
(b) servo track of finishing writing is latched into one of them radial position place;
(c) enable position deviation compensator;
(d) compensator obtains a position error signal;
(e) selected one guarantee from the physical track pattern to the smoothly stable conversion coefficient of changing of virtual magnetic track pattern;
(f) the record harmonic constant can obtain a large amount of harmonic waves according to harmonic constant;
(g) in virtual magnetic track scope to virtual magnetic track definition position deviation signal;
(h) detent moves to path portion in the disk, repeats to carry out next step after (b)-(g) step;
(i) transfer arm moves to the disk outer radius portion, repeats to carry out next step after (b)-(g) step;
(j) use linear interpolation to set up a chart, defined every other virtual magnetic track in the table;
(k) described table is stored in the Nonvolatile storage array;
(l) disk drive is transformed under the virtual magnetic track.
3. the method for utilizing servo data guiding read/write data magnetic track as claimed in claim 2 is characterized in that: described chart is to use linear interpolation to draw according to the harmonic constant of a plurality of radial positions acquisitions of disk.
4. the method for utilizing servo data guiding read/write data magnetic track as claimed in claim 2, it is characterized in that: in virtual magnetic track zone, further comprise a tracking pattern, it is goal track that described pattern is positioned at tracked virtual magnetic track, the described virtual target track location that the position calculation of the current virtual magnetic track of foundation will be sought and the distance of current virtual track location, described distance is according to the position error signal of physical target magnetic track, the position error signal of physics current track and their sine function and determine.
5. the method for utilizing servo data guiding read/write data magnetic track as claimed in claim 2, it is characterized in that: described virtual magnetic track is annular magnetic track, the crosspoint array of described physical track of finishing writing in advance and W head is to obtain by the analysis of use location deviation compensator for the harmonic wave deviation compensation of the servo track of finishing writing earlier, and " internal schema principle " used in described analysis.
6. a device that utilizes servo data guiding read/write data magnetic track comprises: a driving central shaft; One W head; One magnetic head actuating device; One position deviation compensator; One disk; And the printed circuit board (PCB) of the described drive unit of an installation, it is characterized in that: before described disk was not installed on the central shaft, servo-information was finished writing in advance, and had defined a series of rotations " virtual magnetic track " with one heart on disk; At non-volatile burst flash memory stored an array, described array defines described virtual magnetic track according to the physical track of finishing writing in advance and the point of crossing of W head.
7. the device that utilizes servo data guiding read/write data magnetic track as claimed in claim 6 is characterized in that: the physical track of described writing information in advance is not a rotation center to drive central shaft; Described virtual magnetic track based on the physical track definition is annular magnetic track.
8. the device that utilizes servo data guiding read/write data magnetic track as claimed in claim 7, it is characterized in that: the physical track that described basis is finished writing in advance and the crosspoint array of W head are to obtain by the analysis of use location deviation compensator to the harmonic wave runout compensation of the physical track finished writing in advance, and " internal schema principle " used in described analysis.
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| CNB031267521A CN1300767C (en) | 2003-05-30 | 2003-05-30 | Methodand apparatus for guiding read/write data magnetic track by servo-data |
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|---|---|---|---|
| CNB031267521A CN1300767C (en) | 2003-05-30 | 2003-05-30 | Methodand apparatus for guiding read/write data magnetic track by servo-data |
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| CN1300767C true CN1300767C (en) | 2007-02-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5124987A (en) * | 1990-04-16 | 1992-06-23 | Storage Technology Corporation | Logical track write scheduling system for a parallel disk drive array data storage subsystem |
| CN1167982A (en) * | 1996-06-10 | 1997-12-17 | 富士通株式会社 | Head position control for disk drive which performs recording about rotational center even if recorded servo information is eccentric |
| US5926336A (en) * | 1996-09-13 | 1999-07-20 | Samsung Electronics Co., Ltd. | Method and apparatus for rewriting servo information on a disk in a hard disk assembly |
| US6411459B1 (en) * | 1999-02-22 | 2002-06-25 | Seagate Technology Llc | Advanced servo writing method for hard disc drives |
| US6549360B1 (en) * | 1998-05-19 | 2003-04-15 | Seagate Technology Llc | Magnetic recording medium with laser-formed servo-marks |
-
2003
- 2003-05-30 CN CNB031267521A patent/CN1300767C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5124987A (en) * | 1990-04-16 | 1992-06-23 | Storage Technology Corporation | Logical track write scheduling system for a parallel disk drive array data storage subsystem |
| CN1167982A (en) * | 1996-06-10 | 1997-12-17 | 富士通株式会社 | Head position control for disk drive which performs recording about rotational center even if recorded servo information is eccentric |
| US5926336A (en) * | 1996-09-13 | 1999-07-20 | Samsung Electronics Co., Ltd. | Method and apparatus for rewriting servo information on a disk in a hard disk assembly |
| US6549360B1 (en) * | 1998-05-19 | 2003-04-15 | Seagate Technology Llc | Magnetic recording medium with laser-formed servo-marks |
| US6411459B1 (en) * | 1999-02-22 | 2002-06-25 | Seagate Technology Llc | Advanced servo writing method for hard disc drives |
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| Publication number | Publication date |
|---|---|
| CN1553437A (en) | 2004-12-08 |
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