CN100485781C - Method and device producing magnetic reference sample on magnetic disk - Google Patents
Method and device producing magnetic reference sample on magnetic disk Download PDFInfo
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- CN100485781C CN100485781C CNB2006101110926A CN200610111092A CN100485781C CN 100485781 C CN100485781 C CN 100485781C CN B2006101110926 A CNB2006101110926 A CN B2006101110926A CN 200610111092 A CN200610111092 A CN 200610111092A CN 100485781 C CN100485781 C CN 100485781C
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Abstract
The present invention provides a method of generating magnetic reference patterns on a disk or other magnetic media. This involves writing a first magnetic reference pattern to the disk with a servo writer. The disk may then be transferred to a hard disk drive. Control circuitry within the hard disk drive may recognize the first magnetic reference pattern and then position a RW head within the hard disk drive based on the first magnetic reference pattern. As the RW drive is accurately positioned based on the first magnetic reference pattern a second magnetic reference pattern may be written to the disk using the RW head. The RW head location is determined based on the velocity and phase between the read-write head and servo setter marks contained within the first magnetic reference pattern.
Description
Technical field
The present invention relates to magnetic recorder, be specifically related to reference sample is write method and the device of recording magnetic medium, more particularly, relate to a kind of automatic servo write record process.
Background technology
The structure of hard disk drive and working method thereof have been known to the public.Generally speaking, hard disk drive comprises housing (case), has the hard disk of magnetic force variable characteristic, and read/write device.This read/write device comprises read/write (RW) head, and read/write head can change the magnetic of hard disk and data are write disk by (locally) partly, by the magnetic that reads the hard disk part from hard disk reading of data.Hard disk can comprise a plurality of discs, and each disc all is the plane.
All information that are stored in the hard disk all are recorded in the magnetic track.Magnetic track is the concentric circles that is arranged in disc surface.Fig. 1 shows the style (pattern) that is the concentric data magnetic track 12 that radially separates in the hard disk 10.Can visit the data that are stored in the hard disk by moving radially read/write head, for example, drive the radial position of read/write head to the magnetic track that comprises data by magnetic head drive (actuator).Thisly on hard disk, organize the mode of data, make can be easily any part of disk to be conducted interviews, the reason of Here it is hard disk drive is called as " random access " memory storage by magnetic track.
Because each magnetic track is being stored the data of thousands of bytes usually,, be referred to as the sector so usually magnetic track is divided into littler unit.This has just reduced the space of wasting owing to small documents.The user data of each sector storage 512 byte is added a few bytes that is used for internal drive control and is used for Error Checking and Correcting.
Normally (low level formatting creates in the time of LLF) hard disk being carried out low-level formatting for described magnetic track and sector.Low-level formatting is handled and create physical arrangement (magnetic track, sector, control information) on disk.Under the normal situation, this step is carried out on the hard disc that does not comprise information.More modern disk uses and adds very much complex inner structure, comprise subregion bit record (zoned bit recording) and embedded servo data, wherein bit record in subregion is used for being provided with than the more sector of inner track at outer track, and the embedded servo data are used for the control head drive unit.More modern disk also can shield (map out) bad sector pellucidly.Because these complicacy, for the life-span consideration of driver, all at present disks all carry out low-level formatting in factory.
Usually use the outside servo record device (writer) of writing to realize low-level formatting, in manufacture process, the servo record device of writing is write physical arrangement and is recorded in the disk 10.By accurately controlling the servo read/write head position of writing in the record device, described outside, the position of physical arrangement can be set accurately.Because the outside servo record device of writing must have the location accuracy of height, so it has become processing bottleneck expensive in the hard disk drive manufacture process.
(self servo writing SSW) attempts overcoming bottleneck described costliness and consuming time in the automatic servo write record.At first the first magnetic reference sample (servo style (servo pattern)) is write on the surface of recording disk by the servo record device of writing in outside.Then, disc-pack in hard disk drive, is at first carried out LLF in hard disk drive.In SSW, LLF finishes in hard disk drive, and does not need to use other external hardware.This LLF uses by the outside is servo and writes the servo style that the record device writes create physical arrangement on disk.
In a lot of SSW processes, the position of read/write head may be departed from from their target location.After the SSW process finished, this departing from can cause site error.In addition, because each radial track is all based on the position of the magnetic track of formerly writing record, so in the SSW process, so this site error can be accumulated subsequently.Therefore, should solve the accumulation problem of this site error, to reduce or eliminate the site error of accumulating in the SSW process.
Summary of the invention
The technical problem to be solved in the present invention is that the above-mentioned read/write head site error accumulation defective at prior art provides method and the device that can eliminate the accumulation of read/write head site error.
According to an aspect of the present invention, provide a kind of method that is used on disk, producing magnetic reference sample (magneticreference pattern), comprising:
Identify the first magnetic reference sample on (recognizing) disk, wherein, hard disk drive is determined the position of read/write head in hard disk drive based on the described first magnetic reference sample; And
Use read/write head that the second magnetic reference sample is written on the disk in hard disk drive, wherein, (servo setter mark, SSM) speed between and phase place are determined the position of read/write head based on described read/write head and servo positioning mark.
Preferably, the described first magnetic reference sample is the spirality style.
Preferably, described hard disk drive is organized data on the disk based on the described second magnetic reference sample.
Preferably, the described second magnetic reference sample defines sector and the magnetic track on the described disk.
Preferably, the described first magnetic reference sample is to be write by the internal diameter of disk to record external diameter.
Preferably, the described first magnetic reference sample is to be write by the external diameter of disk to record internal diameter.
Preferably, the described first magnetic reference sample is covered by the second magnetic reference sample and rewrites.
According to an aspect of the present invention, provide a kind of hard disk drive, comprising:
Magnetic Disk Controller;
At least one read-write (RW) head;
At least one has the disk of the first magnetic reference sample, wherein, described Magnetic Disk Controller can use described at least one read/write head that the second magnetic reference sample is written on described at least one disk, wherein, depend on the described first magnetic reference sample in the position of at least one read/write head described in the described hard disk drive, wherein, the position of described read/write head is based on speed between described read/write head and the described first magnetic reference sample and phase place and determines.
Preferably, the described first magnetic reference sample comprises spirality style and servo positioning mark (SSM).
Preferably, described hard disk drive can based on the second magnetic reference sample with data organization at least one disk.
Preferably, the position of described read/write head is determined based on speed between read/write head and the SSM and phase place.
Preferably, the described first magnetic reference sample is write record by the servo record device (servo writer) of writing.
Preferably, the described first magnetic reference sample is to be write by the internal diameter of disk to record external diameter.
Preferably, the described first magnetic reference sample is to be write by the external diameter of disk to record internal diameter.
Preferably, the described first magnetic reference sample is covered by the second magnetic reference sample and rewrites.
According to an aspect of the present invention, provide a kind of method that is used for definition sector and magnetic track on disk, comprising:
Use the servo record device of writing the first magnetic reference sample is write to be recorded on the disk;
Disk is transferred in the hard disk drive;
Identify the first magnetic reference sample on the disk, wherein, described disc driver is determined the position of read/write head in hard disk drive based on the described first magnetic reference sample; And
Using read/write head that the second magnetic reference sample is write in hard disk drive records on the disk, wherein, the position of determining read/write head based on the speed between described read/write head and the described first magnetic reference sample and phase place, wherein, sector and magnetic track on the described second magnetic reference sample definition disk.
Preferably, the described first magnetic reference sample is the spirality style.
Preferably, described hard disk drive is organized data on the disk based on the described second magnetic reference sample.
Preferably, the position of described read/write head is determined based on speed between read/write head and the SSM and phase place.
Preferably, the described servo record device of writing comprises laser orientation system, is used for accurately locating the servo read/write head of writing the record device, and wherein, the described servo read/write head of writing the record device can be write the first magnetic reference sample and record on the disk.
Preferably, the described first magnetic reference sample is to be write by the internal diameter of disk to record external diameter.
Preferably, the described first magnetic reference sample is to be write by the external diameter of disk to record internal diameter.
According to an aspect of the present invention, provide a kind of Magnetic Disk Controller that can in disk, produce the magnetic reference sample of definition physical arrangement, comprising:
Magnetic Disk Controller can be connected to the interface module of hard disk drive;
Memory module; With
The processing module that is connected with memory module, wherein, the combination of processing module and memory module can be carried out to give an order:
Identify the initial magnetic reference sample on the disk;
Search the position of read/write head with respect to the initial magnetic reference sample on the disk, wherein, the position of determining read/write head based on the speed between read/write head and the initial magnetic reference sample and phase place; And
The magnetic reference sample that guides read/write head will define physical arrangement is write and is recorded on the disk.
Preferably, described Magnetic Disk Controller is realized with integrated circuit.
Preferably, described interface module also can be connected to hard disk drive on the host computer system.
Various advantage of the present invention, various aspects and character of innovation, and the details of the embodiment of example shown in it will describe in detail in following description and accompanying drawing.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the style of the concentric data magnetic track that radially separates in the magnetic medium of disk;
Fig. 2 is the outside servo system schematic of writing the record device;
Fig. 3 has by the outside is servo to write the synoptic diagram of disk that the record device is write the first magnetic reference sample of record;
Fig. 4 A and Fig. 4 B are the spirality reference samples with various slopes (slopes);
Fig. 5 is the synoptic diagram of hard disk drive according to an embodiment of the invention, and this hard disk drive comprises control circuit, hard disk, magnetic head drive, read/write head and positioning supports arm;
Fig. 6 is the high-level schematic functional block diagram of Magnetic Disk Controller according to an embodiment of the invention;
Fig. 7 A, Fig. 7 B and Fig. 7 C show the radial array of reading the path influence for FTF (football tofootball);
Fig. 8 show when read the path when intersecting with the spirality magnetic track amplitude of detection signal how to change;
Fig. 9 is a time diagram according to an embodiment of the invention, shows how to determine FTF and TCE (track center error, track center error);
Figure 10 provides the method logical flow chart that defines the magnetic reference sample in magnetic medium according to an embodiment of the invention;
Figure 11 provide according to an embodiment of the invention in magnetic medium the logical flow chart of the method for definition sector and magnetic track.
Embodiment
The preferred embodiments of the present invention have been shown in the accompanying drawing, and in each width of cloth accompanying drawing, identical drawing reference numeral is represented identical or corresponding parts.
But embodiments of the invention provide a kind of locating read-write (RW) head, with hard disk drive in realize the automatic servo write record (this system or method can solve above-mentioned demand fully for self-servo writing, SSW) system of Chu Liing or method.The first embodiment of the present invention provides a kind of method that produces the magnetic reference sample, for example produces sector and magnetic track style on magnetic medium or disk.This comprises and uses the servo record device of writing the first magnetic reference sample is write to be recorded in the disk.Then this disk is transferred in the standard hard disk drive device from servo writing the record device.Described hard disk drive comprises Magnetic Disk Controller, this Magnetic Disk Controller can identify the described first magnetic reference sample, and can be based on the speed between the servo positioning mark (SSM) in read/write head and the described first magnetic reference sample and phase differential locating read-write head accurately.By locating read-write head accurately, the second magnetic reference sample of definition physical arrangement (being magnetic track and sector) can be write and record in the disk.
An alternative embodiment of the invention provides a kind of hard disk drive, comprises Magnetic Disk Controller, at least one read/write head, at least one disk or disc.Described disk or disc only comprise the first magnetic reference sample at first.Described Magnetic Disk Controller locating read-write head is recorded in the disk so that the second magnetic reference sample is write, wherein, Magnetic Disk Controller based in read/write head and the described first magnetic reference sample to speed between the SSM and phase differential locating read-write head.
By using speed and phase differential that read/write head is positioned, Magnetic Disk Controller control read/write head is with respect to the speed and the phase place (being the position) of the first magnetic reference sample.This locator meams has reduced or eliminated prior art in the accumulation site error of carrying out occurring when SSW handles.The reducing or eliminate of this site error makes it possible in hard disk with higher quality definition physical arrangement (that is, magnetic track and sector), finally can reach low-cost, high production.
Fig. 2 is the outside servo system schematic of writing record device 30.The outside servo record device 30 of writing comprises head disk assembly (head disk assembly) 32, Magnetic Disk Controller 34, drive unit 36, and the read/write head 38 that is positioned at sway brace 40 ends.Magnetic Disk Controller 34 can determine to write the first magnetic reference sample (servo style) of disk 10.Be used in combination the accurate in locating system, Magnetic Disk Controller 34 can guide the location of read/write head 38 on disk 10, and described accurate positioning system includes but not limited to the laser guidance positioning system.
Fig. 3 has by the outside is servo to write the synoptic diagram of disk 10 that record device 30 is write the first magnetic reference sample 20 of record.In Fig. 3, shown in the first magnetic reference sample 20 be a plurality of spirals 22, comprise a plurality of servo positioning marks (SSM) 24 on each spiral, shown in Fig. 4 A and Fig. 4 B.How the slope that Fig. 4 A and Fig. 4 B show the spiral servo style changes.This style can be write by internal diameter 26 and record to external diameter 28, also can be write by external diameter 28 and record to internal diameter 26.
Slope to each helical pattern 20 and every kind of helical pattern is selected, and makes the outside servo record device of writing can handle disk 10 in the shorter time, and is promptly shorter than writing the required time of as shown in Figure 1 one group of complete concentric magnetic track.In addition, the selection of spiral reference sample 20 should avoid or should reduce with spiral reference sample or other first magnetic-type samples write in the process of recording disk 10 intrinsic site error.Can write record and transfer to the device 30 in the conventional hard disc drive 50 disk 10 is servo from the outside to create physical arrangement (that is, magnetic track and sector) as shown in Figure 1 at disk.
Fig. 5 is the synoptic diagram of hard disk drive 50.Disc driver 50 comprises Magnetic Disk Controller 52, hard disk (magnetic medium) 10, drive unit 54, read/write head 56 and positioning supports arm 58.Magnetic Disk Controller 52 comprises interface module 35, processing module 37 and memory module 39 as shown in Figure 6.Magnetic Disk Controller 52 can be plugged into computer host system, can command the operation of other intrawares in the hard disk drive 50.Magnetic Disk Controller 52 can be realized by the assembly of integrated circuit or series of discrete.
Magnetic Disk Controller 52 can respond the first magnetic reference sample 20, calculates the site error of read/write head 56 with respect to circuit orbit.More specifically, disk control circuit 52 position that can determine read/write head 56 with respect to speed and the phase place of the SSM 24 in the first magnetic reference sample by automatic detection read/write head 56.In the method, hard disk drive controller produces FTF (football to football, " rugby " are to " rugby ", and described " rugby " sees Fig. 8 related description) error signal and TCE (track centererror, track center error) signal.These two kinds of signals provide a kind of feedback signal, and this feedback signal is used to control speed and the phase place of read/write head 56 with respect to SSM 24.Thereby can or easily determine the exact position of the RC magnetic head 56 corresponding first magnetic reference samples.Because this method uses the SSM in the first magnetic reference sample to decide the position of read/write head 56, thereby avoided the site error of accumulation when the definition second magnetic reference sample.When carrying out the SSW processing, determine that based on the servo track of writing record before read/write head 56 to the position, can produce the site error of accumulation.When carrying out the SSW processing, based on the position of SSM decision read/write head, reduced or eliminated the site error of read/write head in the SSW process, the feasible position that can locate servo track more accurately, cost that finally can be lower produces the finished product of better quality.
Most of SSW processes use clocks or timing circuit to come " rugby " to " rugby " (FTF) time between the comparison spiral.Wherein, based on time between the spiral of expection and the error of FTF time, can produce site error.This just requires accurately that clock circuit provides timing signal, determines timing error by using this timing signal.Embodiments of the invention can not need this clock circuit by measuring FTF and track center error (track center error, TCE sees Fig. 9 related description for details), making, wherein, TCE represents phase error.Under the situation of the spiral servo style of known disk, by association rate signal and phase error signal, Magnetic Disk Controller can accurately be determined the position of read/write head.
(FTF) how the time can indicate the speed and the direction of read/write head to " rugby " to " rugby " that Fig. 7 A, 7B and 7C show the read/write head between the SSM 24 in spiral 20 and spiral 20.For example, in Fig. 7 A, the time T s that FTF equals to expect between the spiral.This identity property shows that reading path 60 is radial array (radially aligned), and read/write head suitably keeps constant radial distance (radial distance) in the process of reading.FTF between the spiral shown in Fig. 7 B, shows that reading the path tilts to the internal diameter of disk less than Ts expeced time between the spiral.Similarly, shown in Fig. 7 C be FTF greater than Ts expeced time between the spiral, show that reading the path tilts and read/write head does not keep constant radial position (radial position) to external diameter.For correct radial array, in whole magnetic disk, FTF should equal Ts.
Fig. 8 and Fig. 9 show each time portion of measuring when path 60 intersects with spiral track 20 reading.Because read/write head is along reading path 60, so read path 60 and write a plurality of spiral tracks 20 of record on disk and intersect.The amplitude of the detected signal of read/write head is shown in detection signal 62.Reading before the path intersects with spiral track, the amplitude of detection signal is minimum value or minimal value (nominal value).Reading path 60 when intersecting with spiral track 20, the amplitude of detection signal 60 increases, and all is positioned on the spiral track up to reading the path.At this time, the amplitude of detection signal will reach maximal value.This maximal value will continue to keep, up to reading the part minimizing that the path covers spiral track.At this time, the amplitude restoration of detection signal is to minimum value or minimal value.The amplitude variations of detection signal 62 shown in Fig. 8 read that path and spiral track intersect below time diagram shown in.The amplitude of detection signal forms the shape 64 (for easy, unified it is described of Ben Wenben is " football ", i.e. " rugby ") of diamond or similar rugby, and this will set forth in more detail in conjunction with Fig. 8.
For determining the phase error relevant, determine that track center error (TCE) is important with reading the path.Described track center error is meant between the center of diamond of reading to form when the path intersects with spiral track or class American football shape 64 and the SSM on the spiral track in time with locational poor.Under the ideal situation, should detect SSM at the center of diamond or class rugby ball shape 64.Fig. 8 provides a kind of time diagram that shows the amplitude of detection signal 62, wherein, reading path 60 when intersecting with a series of spiral tracks 20, has formed a plurality of diamonds or class rugby ball shape 64.Within these spiral tracks is SSM 24.These SSM are provided for determining the extra of phase error.This phase error is exactly poor between the position of the center of diamond or class rugby ball shape 64 and detected SSM.
Use in one embodiment of the present of invention simple, sane, method writes down and detects track number and index position flexibly, to improve the efficient of SSW.Typically, for wedge (wedge), each wedge has two spirals.Therefore, the number of spiral is the twice of wedge number.Read/write head detects usually and follows the trail of the spiral of even number set or the spiral of odd number group, and between switches at the appropriate time.When read/write head intersected with spiral on magnetic track, read back waveform (read back signal) looked like the profile of rugby ball shape, as shown in Figure 8.Typically, in a rugby profile, a plurality of SSM and spiral pulse are arranged.Specify two kinds of SSM styles be used for the expression " 1 " (SAM1) and " 0 " (SAM0).On each spiral with 1 bit recording track number.Write down the track number of N bit on the N of even number set and the odd number group spiral.Therefore, no matter magnetic head uses where organize spiral, can both read track number.SSM at the rugby center shows that the track number bit is " 1 " or " 0 ".Even magnetic head has some offtracks, contiguous SSM still can correctly be read.When having three kinds of available SSM styles, will be wherein two kinds of SSM styles be appointed as " 1 " (SAM1) and " 0 " (SAM0), and with this both are written to track center.Three S's SM is called SAMx, is written in all positions except that track center.At the SSM at rugby center indication track number bit is " 1 " or " 0 ".If magnetic head and magnetic track have a certain amount of skew, SAM1 or SAM0 style will in rugby, move forward or after move, but it still can correctly indicate the track number bit.The advantage of this scheme track center that has been mark, and in retaking of a year or grade rugby signal can calculate the side-play amount of read/write head and magnetic track according to SAM1 or SAM0 to the distance at rugby center.This makes that the calculating of timing error is simpler, is clear and accurately because use SSM to produce signal of timing error.
For first bit of accurately knowing track number where, the beginning style before the recording track number.This at the beginning pattern design be invalid track number, and never in track number, occur.The style of selecting 41 bits (40 " 1 " and 1 " 0 ") is style to start with, because track number never surpasses 40 bits.If the SSM of back is available, it can be used as index marker with the indicated angle coordinate; If the SSM of back is unavailable, the beginning style (41 " 1 " and 1 " 0 ") of just using 42 bits is as the index style.
Contiguous track number can be carried out GTG coding (gray coded), make when magnetic head from a magnetic track when next track is searched, have a track number bit mistake at the most.By reading extra track number on the single magnetic track or the track number by the priority of use magnetic track, can easily correct the individual bit error.Per four magnetic tracks are just forming a line in the radial direction.For four magnetic tracks forming one group, the track number of the GTG coding of the GTG of first magnetic track and second magnetic track coding track number and second magnetic track and the 3rd magnetic track is arranged with equidirectional.The track number of the GTG coding of the 3rd magnetic track and the 4th magnetic track is arranged in the opposite direction.Clean effect is exactly from the internal diameter to the external diameter, and all track numbers all are positioned at identical being with.This makes writing of index style and read and become easy.
Track number than standard on, can optimize the length of SSM and SSM hardware detection tolerance (detectiontolerance) and detect (missdetection) with omitting to be used alternatingly error-detecting (false detection).For all track numbers, can use parity check code or error correcting code for example Hamming error correcting code (Hamming code) strengthen the robustness that track number detects.Can write a plurality of track numbers at each magnetic track, so system can improve robustness by using these redundant informations.
Figure 10 provides process flow diagram according to an embodiment of the invention.This process comprises: at first, in step 102, use the servo record device of writing to write the record first magnetic reference sample, for example spiral reference sample.Servo write in the record device the first magnetic reference sample write record disk after, in step 104, this disk is transferred to the hard disk drive from the servo record device of writing.In the step 106, will identify the described first magnetic reference sample to control circuit or hard disk controller in the hard disk drive.Control circuit can be based on the location of the read/write head in this first magnetic reference sample guiding hard disk drive.In the step 108, for example, the described first magnetic reference sample can be the spiral reference sample, and it comprises many SSM marks, and these SSM marks can be used for accurately determining the position of RW head with respect to disk.In the step 110, the read/write head in the use hard disk drive is write the second magnetic reference sample and is recorded on the disk.The described second magnetic reference sample can comprise a series of concentric magnetic tracks that radially separate and the sector in these magnetic tracks.
When writing the record second magnetic reference sample, can determine the position of read/write head based on speed between the SSM in the read/write head and the first magnetic reference sample and phase place with respect to disk.Sector and magnetic track in the second magnetic reference sample definition disk, these sectors and magnetic track can be used for storage and organize data.In addition, in this process, the second magnetic reference sample can cover the first magnetic reference sample.
Figure 11 provides another to be used for defining the sector of disk and the treatment step process flow diagram of magnetic track.In step 122, servo write in the record device spiral reference sample to be write record on the disk.In the step 124, this disk is transferred in the hard disk drive from servo writing the record device.In the step 126, the Magnetic Disk Controller in the hard disk drive identifies described spiral reference sample.In the step 128, the position of read/write head on disk searched and guided to the Magnetic Disk Controller in the hard disk drive based on speed and phase place between the SMM in read/write head and the spiral reference sample.In the step 130,, sector and magnetic track write record in the disk by locating read-write head accurately.Write in the record process at this,, determine the position of read/write head based on speed and the phase place between the read/write head and the first magnetic reference sample.This has been avoided and the error of the accumulation of SSW procedure correlation before, in the SSW process, and the sector of determining the back based on the sector and the magnetic track of definition before and the position of magnetic track.
Generally speaking, the invention provides a kind of method that on disk or other magnetic medium, generates the magnetic reference sample.Comprise and use the servo record device of writing the first magnetic reference sample is write to be recorded on the disk.Then disk is transferred in the hard disk drive from servo writing the record device.Control circuit in the hard disk drive can identify the described first magnetic reference sample, then determines the position of read/write head in disc driver based on this first magnetic reference sample.Because it is pinpoint that read/write head is based on the first magnetic reference sample, record in the disk so can the second magnetic reference sample be write by read/write head.Based on speed and the phase place between the SSM in the read/write head and the first magnetic reference sample, determine the position of read/write head.
Those skilled in the art can be appreciated that, term " basically " or " approximately " as what may use, provide a kind of acceptable in the industry tolerance to corresponding term here.This acceptable in the industry tolerance is from less than 1% to 20%, and corresponding to, but be not limited to, components values, integrated circuit are handled fluctuation, temperature fluctuation, rising and fall time and/or thermonoise.Those skilled in the art also can be appreciated that, term " is operably connected ", as what may use here, comprise by another assembly, element, circuit or module and directly connect and be connected indirectly, wherein for indirect connection, middle plug-in package, element, circuit or module do not change the information of signal, but can adjust its current level, voltage level and/or power level.Can be appreciated that as those skilled in the art, infer connect (that is an element is connected to another element according to inference) comprise between two elements with the method that is same as " being operably connected " directly be connected indirectly.Also can be appreciated that as those skilled in the art, term " comparative result is favourable ", as what may use here, referring to relatively provides a relation of wanting between two or more elements, project, the signal etc.For example, when the relation of wanting is a signal 1 when having amplitude greater than signal 2, when the amplitude of signal 1 during less than signal 1 amplitude, can obtain favourable comparative result greater than the amplitude of the amplitude of signal 2 or signal 2.
The present invention describes by several specific embodiments, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, at particular condition or concrete condition, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the claim scope of the present invention.
CROSS-REFERENCE TO RELATED APPLICATIONS
The application require people such as King Wai Thomas Lau application on September 28th, 2005, application number is No.60/721,456, title is the preference of the U.S. Provisional Patent Application of " READ WARTE (RW) HEAD POSITION CONTROLFOR SELF SERVO WRITING PROCESS ", the application with reference to and in conjunction with its full content.
Claims (10)
1, a kind of method that is used for producing the magnetic reference sample on disk comprises:
Identify the first magnetic reference sample on the disk, wherein, hard disk drive is determined the position of read/write head in hard disk drive based on the described first magnetic reference sample; And
In hard disk drive, use read/write head that the second magnetic reference sample is written on the disk, wherein, the position of determining read/write head based on the speed between described read/write head and the servo positioning mark and phase place.
2, method according to claim 1 is characterized in that, the described first magnetic reference sample is the spirality style.
3, method according to claim 1 is characterized in that, described hard disk drive based on the described second magnetic reference sample with data organization to disk.
4, method according to claim 1 is characterized in that, the described second magnetic reference sample defines sector and the magnetic track on the described disk.
5, a kind of hard disk drive comprises:
Magnetic Disk Controller;
At least one read/write head;
At least one has the disk of the first magnetic reference sample, wherein, described Magnetic Disk Controller uses described at least one read/write head that the second magnetic reference sample is written at least one disk, wherein, depend on the described first magnetic reference sample in the position of at least one read/write head described in the described hard disk drive, wherein, the position of described read/write head is based on speed between described read/write head and the described first magnetic reference sample and phase place and determines.
6, hard disk drive according to claim 5 is characterized in that, the described first magnetic reference sample comprises spirality style and servo positioning mark.
7, a kind of method that is used for definition sector and magnetic track on disk comprises:
Use the servo record device of writing the first magnetic reference sample is write to be recorded on the disk;
Disk is transferred in the hard disk drive;
Identify the first magnetic reference sample on the disk, wherein, disc driver is determined the position of read/write head in hard disk drive based on the described first magnetic reference sample; And
Using read/write head that the second magnetic reference sample is write in hard disk drive records on the disk, wherein, the position of determining read/write head based on the speed between described read/write head and the described first magnetic reference sample and phase place, wherein, sector and magnetic track on the described second magnetic reference sample definition disk.
8, method according to claim 7 is characterized in that, the described first magnetic reference sample is the spirality style.
9, a kind of Magnetic Disk Controller that can produce the magnetic reference sample of definition physical arrangement in disk comprises:
Magnetic Disk Controller can be connected to the interface module of hard disk drive;
Memory module; With
The processing module that is connected with memory module, wherein, the combination of processing module and memory module can be carried out to give an order:
Identify the initial magnetic reference sample on the disk;
Search the position of read/write head with respect to the initial magnetic reference sample on the disk, wherein, the position of determining read/write head based on the speed between read/write head and the initial magnetic reference sample and phase place; And
The magnetic reference sample that guides read/write head will define physical arrangement is write and is recorded on the disk.
10, Magnetic Disk Controller according to claim 9 is characterized in that, described Magnetic Disk Controller is realized with integrated circuit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72145605P | 2005-09-28 | 2005-09-28 | |
| US60/721,456 | 2005-09-28 | ||
| US11/269,068 | 2005-11-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101004917A CN101004917A (en) | 2007-07-25 |
| CN100485781C true CN100485781C (en) | 2009-05-06 |
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| CNB2006101110926A Expired - Fee Related CN100485781C (en) | 2005-09-28 | 2006-08-14 | Method and device producing magnetic reference sample on magnetic disk |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104867503A (en) * | 2014-02-25 | 2015-08-26 | 株式会社东芝 | Clock Accuracy Determining Method And Clock Accuracy Determining Device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104867503A (en) * | 2014-02-25 | 2015-08-26 | 株式会社东芝 | Clock Accuracy Determining Method And Clock Accuracy Determining Device |
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| Publication number | Publication date |
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| CN101004917A (en) | 2007-07-25 |
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