CN201051397Y - Disk driver for overcoming the track location deviation - Google Patents
Disk driver for overcoming the track location deviation Download PDFInfo
- Publication number
- CN201051397Y CN201051397Y CNU2006200166737U CN200620016673U CN201051397Y CN 201051397 Y CN201051397 Y CN 201051397Y CN U2006200166737 U CNU2006200166737 U CN U2006200166737U CN 200620016673 U CN200620016673 U CN 200620016673U CN 201051397 Y CN201051397 Y CN 201051397Y
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- track
- disk
- head
- magnetic track
- deviation
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Abstract
The utility model relates to a disk drive to overcome positional deviation of tracks, which comprises a drive central shaft, a read/write head, a head component, a positional deviation compensator, a disc and a printed circuit board. Before the disc is assembled on the central shaft, physical magnetic tracks are written in advance. An array which is provided with a series of concentric virtual magnetic tracks according to the crossing points of the physical magnetic tracks and the read/write head is stored in a non-volatile flash memory. When the disc drive is in operation, the concentric virtual magnetic tracks can decrease the moving amplitude of the head component to increase the acceptable tolerance of positional deviation. The write operation of the physical magnetic tracks in advance can improve the operating efficiency of the disc drive and decrease the requirements of a clean room.
Description
[technical field]
The present invention relates to a kind of disc driver, be specifically related to a kind of disc driver that can overcome the track location deviation.
[background technology]
Disc driver is a kind of magnetic data memory storage, the data that the user creates can be carried out read-write operation.Typical disc driver comprises one or more disks, and disk can be around central shaft with high angular velocity (typical angular velocity is 7200rpm) rotation.Head stack 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 head stack will be positioned on the magnetic track by W head, still operate under the concentric with first front disk and central shaft, the read/write of data will be difficult to correctly carry out this moment.When disk departs from its corresponding position, 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 took place, W head wanted 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 do not have existing additional information that read/write head is directed to correct track on the disk exactly, 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 disc driver in advance before user data writes and after the driver element assembling.
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 disc driver 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 head stack signal that affords redress.
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.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]
Technical matters to be solved by this invention is: traditional disk drives can't overcome the problem of track location deviation.
The technical scheme that solves the problems of the technologies described above is: a kind of disc driver that overcomes the track location deviation comprises the driving central shaft, W head, head stack, position deviation compensator, disk and printed circuit board (PCB).Before described disk is not installed on the central shaft, physical track is finished writing in advance, one non-volatile burst flash memory stored an array, the physical track that described array basis is finished writing in advance is provided with the concentric virtual magnetic track of series with the crosspoint array of W head on disk.
It is described that to have the disk that writes physical track information in advance be the center to drive central shaft no longer.
Described crosspoint array is to be produced by the harmonic wave runout compensation analysis of position deviation compensator to the physical track finished writing in advance.
The present invention adopts technique scheme, its beneficial technical effects is: compared with prior art, advantage applies of the present invention is: need not to sacrifice the accurate location that data capacity is finished data track, simplify and improve the efficient of servo data imprinting, and reduce the imprinting expense.When disc driver was worked, concentric virtual magnetic track can reduce the movement range of head stack, increased acceptable position deviation tolerance.Setting in advance of disk physical track can improve the efficient that disc driver is assembled, and can reduce the requirement to clean room.In operation to driver, the minimizing as far as possible of head stack action, rather than the position deviation of often following the trail of physical track.In a word, disc 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]
Below by embodiment also in conjunction with the accompanying drawings, the present invention is described in further detail:
Fig. 1 is the vertical view that the present invention overcomes the disc driver of track location deviation.
Fig. 2 is the disk synoptic diagram of the present invention's disc driver of overcoming the track location deviation.
[embodiment]
Please refer to Fig. 1 to Fig. 2, a kind of disc driver and device that overcomes the track location deviation, comprise disc driver base 20, be installed in the disk 10 of base 20, drive central shaft 11, be supported on the head stack 32 of base 20 by rotating shaft 34, be installed in the W head 40 and the position deviation compensator that is connected with W head 40 of head stack 32 ends.
The disk 10 of disc driver of the present invention is inscribed earlier physical track, installs them into then to drive on the central shaft 11, and W head 40 and head stack 32 can be worked.This method has reduced the disc driver assembling greatly and has operated the requirement that has reduced simultaneously the space cleanliness.In addition, the present invention is with respect to the present employed servo track recorder that is installed on the magnetic head, use be a kind of magnetic disk servo magnetic track recorder that is not installed in the driver, it is a kind of 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.A magnetic disk servo magnetic track recorder that is not installed in the driver can be inscribed a folded disk simultaneously at a high speed.
It is " virtual magnetic track " 15 that the present invention need introduce in new ideas, and it is to be defined by the magnetic track that W head 40 is followed, and this magnetic track is not the track of the storage data of reality on the disk 10.Virtual magnetic track 15 is that the rotating shaft with actual disk is the imaginary annular trace in center, arranges and write in advance memory address definition " virtual " this notion of physical track pattern intersection point by magnetic track.Because concentric virtual magnetic track is the constant characteristic that disk has been installed, they can allow servo data to write another servo track recorder unit.
The address that is used for defining virtual magnetic track 15 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 15 can guide W head 40, W head 40 also can need not to follow the trail of the magnetic track of dislocation.The normal condition of head stack 32 is static, follows the trail of virtual magnetic track 15 by the next track address of loading and look for storage sequence.In fact, the stationary state of head stack is the standard of measurement of virtual magnetic track premium properties.
At first, a virtual magnetic track 15 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.
The present invention finishes writing physical track 12 in advance on disk, this disk 10 is installed to define a series of " virtual magnetic tracks " with one heart on the driving central shaft 11 and on disk to be used for tracking and tracking subsequently.The concentric effect of virtual magnetic track 15 and the rotary middle spindle of disk is put unlike the prior art and is can keep head stack to be in still-mode when driver 11 work, 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 disc driver.
Seeing also Fig. 2, is the vertical view that adopts the typical disk 10 of the inventive method installation.Physical track 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.
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 UsingInternal Model Equivalence; " International Journal of AdaptiveControl and Signal Processing, 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.
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.
Driving is 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 (w
rT)-k
2Cos (w
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 (3)
1. a disc driver that overcomes the track location deviation comprises the driving central shaft with installation site deviation, W head, head stack, position deviation compensator and disk, inscribe in advance on the described disk physical track is arranged, it is characterized in that: also comprise the non-volatile burst flash memory that stores the array of being made up of the point of crossing deviate of physical track address and W head, described position deviation compensator is provided with the concentric virtual magnetic track of series according to the array in the non-volatile burst flash memory on disk.
2. the disc driver that overcomes the track location deviation as claimed in claim 1 is characterized in that: described 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.
3. the disc driver that overcomes the track location deviation as claimed in claim 2 is characterized in that: described position deviation compensator is determined position between the described virtual magnetic track point of crossing by linear interpolation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200166737U CN201051397Y (en) | 2006-12-22 | 2006-12-22 | Disk driver for overcoming the track location deviation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200166737U CN201051397Y (en) | 2006-12-22 | 2006-12-22 | Disk driver for overcoming the track location deviation |
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| Publication Number | Publication Date |
|---|---|
| CN201051397Y true CN201051397Y (en) | 2008-04-23 |
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ID=39337891
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200166737U Expired - Fee Related CN201051397Y (en) | 2006-12-22 | 2006-12-22 | Disk driver for overcoming the track location deviation |
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| Country | Link |
|---|---|
| CN (1) | CN201051397Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108074621A (en) * | 2016-11-10 | 2018-05-25 | 希捷科技有限公司 | Detection to Z axis nonoperational shock |
-
2006
- 2006-12-22 CN CNU2006200166737U patent/CN201051397Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108074621A (en) * | 2016-11-10 | 2018-05-25 | 希捷科技有限公司 | Detection to Z axis nonoperational shock |
| CN108074621B (en) * | 2016-11-10 | 2021-07-09 | 希捷科技有限公司 | Detection of non-operational Z-axis impacts |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080423 Termination date: 20131222 |