CN1101160A - Magnetic disk drive and method for setting up and utilizing identification fields - Google Patents
Magnetic disk drive and method for setting up and utilizing identification fields Download PDFInfo
- Publication number
- CN1101160A CN1101160A CN94105831A CN94105831A CN1101160A CN 1101160 A CN1101160 A CN 1101160A CN 94105831 A CN94105831 A CN 94105831A CN 94105831 A CN94105831 A CN 94105831A CN 1101160 A CN1101160 A CN 1101160A
- Authority
- CN
- China
- Prior art keywords
- magnetic track
- magnetic
- sector
- section
- identification section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4886—Disposition of heads relative to rotating disc
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
- Digital Magnetic Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
The object of the invenion is to improve the read error rate for identification (ID) information in a sector servo type magnetic disk drive with a head comprising separate read and write elements. A pair of ID fields 21a and 21b are set up in each sector In each track of a magnetic disk for recording ID Information. The pair of ID fields are separated from each other along the track and radially displaced with respect to each other by a distance equal to an offset between the read element 24 and the write element 23 associated with the track. In a data write operation for a trace the magnetic head is positioned so as to read the ID information in the ID field 21b with the read element 23. In a read operation for the track, the head is positioned so as to read the ID information in the ID field 21a with the read element 23.
Description
The present invention relates to have the disc driver of magnetic head, this magnetic head comprises independent read and write element, the invention still further relates to will indicate that (ID) information writes disk and by considering that effective skew between two read-write elements utilizes the method and the element of id information.
When disc driver used the sector servo system, each magnetic track on the magnetic disc storage surface in a plurality of magnetic tracks was divided into a plurality of sectors, and each sector comprises servo section, ID section and data segment.When the data in to predetermined sector in the data segment read or write, reading id information from the ID section of sequential sectors was necessary for disk.Recently, the dual-element head that independent read and write element is housed is widely used as magnetic head.
Should consider effective skew between the read and write element for the dual-element magnetic head.When head position to magnetic track, what the read and write element can be with respect to magnetic track vertically makes lateral excursion in other words conj.or perhaps along the radial direction skew of disk.This skew derives from the deviation between production tolerance or magnetic head and the magnetic track.Owing to there is this skew, if magnetic head is located by the center line of writing component is alignd with the center line of magnetic track (or data segment) during write data, the center line of reading component just exists skew with the center line of magnetic track so.Equally, head position is that the center line of reading component is alignd with the center line of magnetic track when read data, and just there is skew in the center line of writing component with the center line of magnetic track.Importantly reading component is all wanted correctly to read id information in both cases.
The typical format of each sector under the prior art as shown in Figure 3, an ID section 31 is arranged to and track centreline 35 symmetries among the figure, this track centreline is to be predetermined by the servo-information that is recorded in the servo section 30.In this example, if the off-set value between reading component 34 and the writing component 33 represents that with d the center line 37 of data segment 32 is with regard to the distance of the center line 35d/2 of dextrad offset track and ID section so.During write data, by positioning head is alignd with the center line 37 of data segment 32 in the center of writing component 33, shown in Fig. 3 (A), and during read data, magnetic head is by Center-to-Center line 37 alignment of reading component 34 are located, shown in Fig. 3 (B).In either case, owing to reading component 34 is positioned in ID section 31 scopes fully, so its read error rate of reading id information will be improved a little.
Yet as can be seen from Figure 3, in the read and write operation, reading component is to be positioned on its center line 36 or 37, and the distance of center line 36 or 37 lateral excursion ID section center line 35d/2, so the read error rate of id information is higher than the read error rate of data inevitably.In addition, because the usually additional error correction sign indicating number of data, so improved the read error rate of data fully.Therefore, id information is the determinative in the whole mistake.
So fundamental purpose of the present invention provides the technology of the read error rate of improving id information.
More clear and definite purpose of the present invention provides the disc driver with a pair of ID section, and this is used so that improve the read error rate of id information in can selecting in data read and write operation the ID section.
Another more clear and definite purpose of the present invention provide to a plurality of sectors in the magnetic head of sector servo type disc driver each set up the method for a pair of ID section, in order to improve the read error rate of id information, also provide the method for setting up and use this ID section simultaneously.
In comprising the sector servo type disc driver of independent read and write element, set up a pair of identification section for each sector in each magnetic track of disk and be used for Record ID information on that sector.This is separated from each other and one another along distance of radial direction skew, this distance equals the skew between the read and write element along magnetic track to identification section.Positioning head is so that reading component can be read this to one in the ID section in the data write operation process of magnetic track, and positioning head is so that reading component is read another ID section in the data reading operation process of magnetic track.
Fig. 1 is an organigram of realizing sector servo type disc driver of the present invention;
Fig. 2 represents to have according to the present invention the sector and the relation of all places between reading component and the writing component of a pair of ID section;
Fig. 3 represents to have according to prior art the sector and the relation of all places between reading component and the writing component of an ID section; And
Fig. 4 is the offtrack distance of this element of expression and the graph of a relation between the read error rate.
20 servo section
21a reads the ID section
21b writes the ID section
22 data segments
23 writing components
24 reading components
26 write the center line of ID section
27 read the center line of ID section and data segment
As shown in Figure 1, realize that sector servo type disc driver of the present invention comprises disk 1, magnetic head 2, rotation motor 3, prime amplifier 4, read/write channel 5, controller 6 and servocontrol and driving circuit 7.Magnetic head 2 is the dual-element magnetic heads that comprise independent read and write element.Disk 1 has a plurality of magnetic tracks, and each magnetic track is divided into a plurality of sectors again.Therefore controller 6 can navigate to magnetic head 2 on the predetermined magnetic track by servocontrol and driving circuit 7 CD-ROM drive motor 3.Controller 6 can comprise hard disk controller, microprocessor and memory element.
Next Fig. 2 represents that formative sector concerns with all places of meeting and discussing between 2 according to the present invention.But only represented the reading component 24 and the writing component 23 of magnetic head 2 among the figure, and omitted the slide of two elements of support.Object lesson use magnetoresistance (MR) type sensor of magnetic head 2 is as reading component 24 and use film induction (TFI) type sensor as writing component 23.As can be seen from Figure 2, between servo section 20 and data segment 22, set up a pair of ID section.That is, read ID section 21a and write ID section 21b.The illustrated ID of reading section 21a is an example with the layout of writing ID section 21b, and the order of two ID sections is certainly changed.ID section 21a and 21b are separated from each other and are offset a distance each other along radial direction (among Fig. 2 laterally) along magnetic track, and this distance equals off-set value S, and S represents the radial deflection between reading component relevant with magnetic track 24 and the writing component 23.The respective process that each of a plurality of sectors in the magnetic track is provided with such ID section 21a and 21b is as follows:
(I) at first prepares the off-set value what a represents radial deflection between the read and write element when being each positioning head 2 of a plurality of magnetic tracks.When using rotation motor 3, because the skew of 2 pairs of magnetic tracks of magnetic head is different along with the difference of magnetic track, so for each magnetic track, the radial deflection between the read and write element is also just different.Therefore, need prepare different off-set values to each magnetic track.For instance, this off-set value can obtain by calculating, and the skew between two elements that the skew owing to production tolerance or 2 pairs of magnetic tracks of magnetic head causes has been considered in this calculating.
(II) S is expressed as the off-set value of preparing according to selected magnetic track, and T is expressed as the value that the radial width by servo section in this magnetic track is predetermined.Under the control of the controller 6 of Fig. 1, as shown in Figure 2, magnetic head 2 be positioned in case with the centralized positioning of reading component 24 to the line 26 of representing first radial position, 25 1 of offset track center lines are apart from T left in first radial position, and track centreline 25 is to be determined by the servo-information in the servo section 20.Then, under corresponding timing, read ID section 21a by setting up in each sector that corresponding id information is written to this magnetic track with writing component 23.Although T=s/2 in this example, it might not be this value, and it also can equal other value.Because off-set value is S, so the center of writing component 23 is on the line 27 of representing second radial position, and second radial position is the distance of offset track center line 25T=s/2 to the right.So line 27 becomes the center line of reading ID section 21a, and also be the center line of data segment 22 therefore.
(III) is under the control of controller 65, shown in Fig. 2 (B), magnetic head 2 be positioned in case with the centralized positioning of reading component to the line 26 of representing second radial position, second radial position is offset track center line 26T+S distance left, then, under corresponding timing, write ID section 21b by setting up in each sector that corresponding identification information is written to this magnetic track with writing component 23.In this case, because on the center online 26 of writing component 23, so line 26 becomes the center line of writing the ID section.
(IV) is for all magnetic track repetitive operation (II) and (III).Certainly the order of (II) and (III) can exchange so that ID section 21b is write in foundation earlier, and then sets up and read ID section 21a.
Therefore set up read ID section 21a and write ID section 21b selectively is used to read or write data.At first, in the data write operation process to a magnetic track, shown in Fig. 2 (C), magnetic head 2 is positioned so that being centrally located in of reading component 24 write on the center line of ID section 21b, and reading component 24 is write the ID section 21b from this and read id information.Writing component 23 will be write in the data segment 22 by the data that Fig. 1 read/write channel 5 and prime amplifier 4 send then.On the other hand, in the data reading operation process of this magnetic track, as Fig. 2 (D) institute method, magnetic head 2 is positioned so that being centrally located in of reading component 24 read on the center line of ID section 21a and data segment 22, and reading component 24 reads id information from read ID section 21a and reading of data from data segment 22.
Its less important consideration read error rate.Generally, the read error rate is with 10
-nForm is represented.This means and whenever read 10
nA bit mistake can take place in individual bit.Among Fig. 4, when use is equivalent to about 5000TPI(tracks per inch) the reading component width time, V-shaped basically curve E expresses the relation between reading component offtrack distance and the read error rate substantially.Yet, for error rate only represented its logarithm value or-n.According to the present invention, in any operating process of data write or read, on any one the center line that is centrally located in two ID section 21a and 21b of reading component 24, the distance of offtrack is close to 0 like this, so the logarithm value of read error rate remains near the low value of minimum value-10 of curve E.
On the other hand, under current techniques situation as shown in Figure 3, because reading component 34 is the states that are in offtrack, the center of reading component always is offset the distance of the center line d/2 of ID section 31 to the left or to the right under this state, so read error rate become higher (worse).As an example, in order to satisfy in transmission 10
10Only allow the requirement of an ID read error rate during Bit data, suppose that ID section 31 is that 7 bytes (56) length and ID section 32 are that 512 bytes (4096) are long here, if the needed error that misreads of ID is 10 so
-x, following relational expression is set up:
1-（1-10
-x）
56＝（1
10/4096）
-1
From this relational expression, can get-x=-8.14.The error rate of this value is corresponding to the offtrack distance of about 0.5 μ m in Fig. 4.Under current techniques, the requirement that obtains foregoing d/2, about 0.5 μ m is quite strict.It is very difficult further reducing error rate by this distance of further shortening.If track density further strengthens or the size of disk does more, it is so strict so that current techniques can not satisfy this requirement at all that so this requirement becomes.Yet the present invention just can satisfy this requirement fully.
The present invention can improve the read error rate of id information.
Claims (8)
1, have the disc driver of the magnetic head that comprises independent read and write element, it is characterized in that:
Disk has a plurality of magnetic tracks, each magnetic track is divided into a plurality of door leaf district, there is a pair of identification section each sector in each magnetic track, these two identification sections are separated from each other and are offset a distance each other along radial direction along described magnetic track, this distance equal described read and writing component between the inclined to one side title with respect to described magnetic track, described identification section has write down the identification information of described sector; And
Described head position element, it makes described reading component can read out a identification section in the described a pair of identification section in the data write operation of any described magnetic track, and described head position device also make reading component can read one other identification section in the described a pair of identification section in the data reading operation of brown magnetic track.
2, the disc driver of claim is characterized in that
Each sector has data segment, and in fact the center line of another identification section in the described a pair of identification section is positioned on the identical radial location with the center line of described data segment.
3, claim 1 or 2 disc drivers that require is characterized in that
Described head position element has a rotation motor, and described radial deflection is different along with the difference of magnetic track.
4, the desired disc driver of any one in the claim 1 to 3 is characterized in that
Described reading component is the magnetic resistance effect type sensor, and described writing component is a film induction type sensor.
5, be divided into again in the sector servo type disc driver of disk of a plurality of sectors the magnetic head that comprises independent read and write element being housed and having a plurality of magnetic tracks, each magnetic track, in each sector of described a plurality of sectors, set up the method for identification section, it is characterized in that comprising the steps:
Calculate the off-set value of each magnetic track in described a plurality of magnetic track, described skew represent when described head position is on each magnetic track described read and writing component between radial deflection, and
The identification information relevant with described sector write in a pair of identification section, and this is separated from each other and described off-set value of calculating according to each magnetic track of radial deflection each other along each magnetic track in each sector of each magnetic track to identification section.
6, be divided into again in the sector servo type disc driver of disk of a plurality of sectors the magnetic head that comprises independent read and write element being housed and having a plurality of magnetic tracks, each magnetic track, each sector has a servo section that comprises servo-information, set up the method for identification section in each sector in described a plurality of sectors, this described method is characterised in that and comprises the steps:
(a) be that each of described a plurality of magnetic tracks is prepared an off-set value, described off-set value is represented the radial deflection between the described reading component and writing component when described head position is on each magnetic track;
(b) described reading component is positioned on the position in first and second radial position, these two positions are offset T distance and T+S distance with the center line of selected magnetic track along identical direction respectively, and described writing component is write into corresponding identification information in each sector of described magnetic track in order to set up first identification section, described S is the off-set value of preparing for described selected magnetic track, described T is the value that the width by servo section in the described magnetic track is predetermined, and the described center line of described magnetic track is the servo-information decision by described servo section.
(c) described reading component is positioned on another position in described first and second radial position and described writing component is write into corresponding identification information in each sector of described magnetic track in order to set up second identification section; And
(d) repeat described rapid (b) and (c) finish up to described first identification section of all described a plurality of magnetic tracks and the foundation of described second identification section.
7, the method for claim 6 requirement is characterized in that described disc driver drives described magnetic head by rotation motor, and the different off-set values of each magnetic track are ready in described step (a).
8, the magnetic head that comprises independent read and write element is being housed and is having a plurality of magnetic tracks, each magnetic track is divided into again in the sector servo type disc driver of disk of a plurality of sectors, each sector has the servo section that comprises servo-information, set up the method for identification section in each sector in described a plurality of sectors, this described method is characterised in that and comprises the steps:
(a) be that each of described a plurality of magnetic tracks is prepared an off-set value, described off-set value is represented the radial deflection between the described reading component and writing component when described head position is on each magnetic track;
(b) described reading component is positioned on the position in first and second radial position, these two positions are offset T distance and T+S distance with the center line of selected magnetic track along identical direction respectively, and described writing component is write into corresponding identification information in each sector of described magnetic track and is used for setting up first identification section, described S is the off-set value of preparing for described selected magnetic track, described T is the value that the width by servo section in the described magnetic track is predetermined, and the described center line of described magnetic track is the servo-information decision by described servo section.
(c) described reading component is positioned on another position in described first and second radial position, and described writing component is write into corresponding identification information in each sector of described magnetic track in order to set up second identification section;
(d) repeating said steps (b) and (c) fill out described first identification section of all described a plurality of magnetic tracks and the foundation of described second identification section is finished; And
(e) in the data write operation of magnetic track, with described head position so that can will be used for from a described identification section, reading identification information on any one center line in being centrally located in of described reading component described first and second identification section, and in data reading operation, described head position is used for reading identification information from another identification section so that described reading component can be positioned on another the center line in described first and second identification section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP155007/93 | 1993-06-25 | ||
| JP5155007A JPH0737216A (en) | 1993-06-25 | 1993-06-25 | Magnetic disk device and method for setting and utilizing identification field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1101160A true CN1101160A (en) | 1995-04-05 |
Family
ID=15596657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94105831A Pending CN1101160A (en) | 1993-06-25 | 1994-05-25 | Magnetic disk drive and method for setting up and utilizing identification fields |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH0737216A (en) |
| KR (1) | KR950001603A (en) |
| CN (1) | CN1101160A (en) |
| GB (1) | GB2279491B (en) |
| TW (1) | TW247958B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382192C (en) * | 2003-11-28 | 2008-04-16 | 株式会社东芝 | Apparatus for magnetic recording and method for measuring the offset amount |
| CN100585702C (en) * | 2006-08-31 | 2010-01-27 | 国际商业机器公司 | Apparatus, system, and method for detecting a periodic sequence of servo signals |
| US8984218B2 (en) | 2005-06-24 | 2015-03-17 | Hewlett-Packard Development Company, L.P. | Drive indicating mechanism for removable media |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751512A (en) * | 1994-01-28 | 1998-05-12 | Seagate Technology, Inc. | Data storage format for data storage devices having a radial offset between read and write elements |
| KR100373879B1 (en) * | 1995-01-27 | 2003-04-21 | 시게이트 테크놀로지 엘엘씨 | Dual identification for data fields of a disk drive |
| KR100408388B1 (en) * | 1996-05-17 | 2004-03-18 | 삼성전자주식회사 | Method for setting read channel factor value of hdd |
| KR100496178B1 (en) * | 1997-12-29 | 2005-09-13 | 삼성전자주식회사 | Information retrieval method of system area in disk for storing information of disk drive for storing information |
| SG112803A1 (en) * | 2000-09-27 | 2005-07-28 | Seagate Technology Llc | Writing servo sectors to a disc drive using offset heads |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05225509A (en) * | 1991-10-02 | 1993-09-03 | Hitachi Ltd | Magnetic disk and magnetic disk device using it |
-
1993
- 1993-06-25 JP JP5155007A patent/JPH0737216A/en active Pending
-
1994
- 1994-04-11 TW TW083103142A patent/TW247958B/zh active
- 1994-05-25 CN CN94105831A patent/CN1101160A/en active Pending
- 1994-05-25 KR KR1019940011339A patent/KR950001603A/en active IP Right Grant
- 1994-06-07 GB GB9411354A patent/GB2279491B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382192C (en) * | 2003-11-28 | 2008-04-16 | 株式会社东芝 | Apparatus for magnetic recording and method for measuring the offset amount |
| US8984218B2 (en) | 2005-06-24 | 2015-03-17 | Hewlett-Packard Development Company, L.P. | Drive indicating mechanism for removable media |
| CN100585702C (en) * | 2006-08-31 | 2010-01-27 | 国际商业机器公司 | Apparatus, system, and method for detecting a periodic sequence of servo signals |
Also Published As
| Publication number | Publication date |
|---|---|
| TW247958B (en) | 1995-05-21 |
| JPH0737216A (en) | 1995-02-07 |
| GB9411354D0 (en) | 1994-07-27 |
| GB2279491B (en) | 1997-02-05 |
| KR950001603A (en) | 1995-01-03 |
| GB2279491A (en) | 1995-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4056830A (en) | Utilizing data for transducer positioning | |
| US20060018051A9 (en) | Vertical track zoning for disk drives | |
| US6157511A (en) | Disk drive with variable-phase servo burst patterns | |
| KR100618884B1 (en) | Method for writing servo information of disk drive | |
| JPH08255448A (en) | Disc recording/reproducing apparatus and its self servo writing method | |
| CN101471084A (en) | Disk drive device and head positioning control method | |
| CN1983390B (en) | Method for encoding servo position information on magnetic storage medium and servo writing magnetic head | |
| CN1101160A (en) | Magnetic disk drive and method for setting up and utilizing identification fields | |
| CN1276409C (en) | Method and apparatus for writing servo data using magnetic recording | |
| CN101192415A (en) | Method and apparatus for writing servo data in a disk drive using spiral servo patterns | |
| CN101339770B (en) | Method of increasing recording density of hard disc drive and controlling device thereof | |
| US7511912B2 (en) | Writing multiple servo sector patterns to improve servo sector alignment on multiple surfaces | |
| KR100574941B1 (en) | Servo writing method for hard disk drives | |
| US6005740A (en) | Method and apparatus for developing position error curves for magneto-resistive heads | |
| US5801897A (en) | Head positioning control system for use in a disk storage system | |
| KR100855981B1 (en) | Write factor setting method and disk drive separately setting write factor for each of the plurality of heads | |
| JP3078224B2 (en) | Magnetic disk drive and head positioning control system applied thereto | |
| CN101471087A (en) | Disk drive having a disk of discrete-track media type | |
| JPH0546961A (en) | Magnetic recording and reproducing device | |
| US8730604B2 (en) | Writing a reference pattern to bit patterned media | |
| JP3259097B2 (en) | Servo control method | |
| KR100233669B1 (en) | A servo burst recording and a servo control method for compensating an amount of track shift | |
| US6865041B1 (en) | Method and apparatus for servowriting using a unipolar write current | |
| CN101145350A (en) | Method and apparatus for writing servo data and positioning head in a disk drive | |
| JP2646748B2 (en) | Disk storage device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |