GB2235565A - Method of allocation of logical sectors in a magnetic disk apparatus and an access method therefor - Google Patents
Method of allocation of logical sectors in a magnetic disk apparatus and an access method therefor Download PDFInfo
- Publication number
- GB2235565A GB2235565A GB9015859A GB9015859A GB2235565A GB 2235565 A GB2235565 A GB 2235565A GB 9015859 A GB9015859 A GB 9015859A GB 9015859 A GB9015859 A GB 9015859A GB 2235565 A GB2235565 A GB 2235565A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic disk
- logical sectors
- outer circumference
- allocation
- logical
- 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.)
- Withdrawn
Links
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
- G11B5/48—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
- G11B5/54—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 with provision for moving the head into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
- G11B5/553—Details
- G11B5/5534—Initialisation, calibration, e.g. cylinder "set-up"
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
Abstract
A method of allocation of the logical sectors of a magnetic disk apparatus comprises allocating the logical sectors on a head-type magnetic disk continuously on one surface from the inner circumference to the outer circumference, and then continuously conducted on the other surface from the outer circumference to the inner circumference. In addition, an access method is disclosed whereby the heads are accessed in accordance with this allocation. In other embodiments the formatting may commence at the outer circumference on one side, terminating with the outer surface of the second side, or a series of disks may be processed sequentially wherein continuous allocation of one side of a first disk is carried out from the inner side to the outer side or vice versa, and reverse allocation then carried out on the one side of the next disk.
Description
METHOD OF ALLOCATION OF LOGICAL SECTORS ON A MAGNETIC DISK APPARATUS AND
AN ACCESS METHOD THEREFOR Background of the Invention
(Field of the Invention)
This invention relates to a magnetic disk apparatus which uses a sector servo system.
(Prior Art)
Conventionally, in the allocation of logical sectors on a magnetic disk, as Fig. 3 shows, for example, 9-12 are allocated on track n on the upper surface of magnetic disk la by head m, and continuing, the head is switched from m to m+l, and 13-16 are allocated on track n on the lower surface of magnetic disk la. Next, the head is switched from m+l to m, and 17-20 are allocated on track n+l. Continuing, the head is switched from m+l to m, and 21-24 are allocated on track n+l. After this, the logical sectors are allocated in the same way on each track while switching the head between m and m+l.
However, in the case in which the conventional logical sector allocation method is applied to a magnetic disk apparatus using differing head actuators when writing data to servos or when writing or reading data, as is shown in Fig. 4, in this type of magnetic disk apparatus, since the inclination of the pivot axis of the head actuator with regard to the rotational axis of the spindle motor is large, when the head is switched, it is not possible to access the identical track, and as a result, when the logical sectors are accessed, each time the head is switched, multitrack seeking must be carried out, and the positioning of the head thus carried out. However, there is a problem in that it takes a long time to access because of this multi-track seeking each time the head is switched.
1 Summary of the Invention
The present invention solves the problems mentioned above; its purpose is to provide a logical sector allocation method as well as an access method for magnetic disk apparatuses by which it is possible to access in a short time.
The magnetic disk logical sector allocation method of the present invention is characterized in that logical sectors are continuously allocated on one surface of a magnetic disk from the inner circumference to the outer circumference, and then logical sectors are continuously allocated on the other surface of the magnetic disk from the outer circumference to the inner circumference.
Furthermore, the magnetic disk logical sector access method of the present invention is characterized in that the heads are accessed according to the logical sectors allocated on the said magnetic disk by means of the said logical sector allocation method.
According to the method of the present invention, after the continuous allocation of logical sectors has been carried out on one surface of a magnetic disk from the inner circumference to the outer circumference, the continuous allocation of logical sectors is carried out on the other surface of the magnetic disk from the outer circumference to the inner circumference, so that, with the exception of the case in which the head is switched at the time of the movement from one surface to the other, in the case in which the continuous accessing of the logical sectors is carried out, access is completed after single-track seeking, so that the access time is shortened in comparison to conventional methods, and efficient access can be realized.
Brief Description of the Drawings
Figure 1 explains a magnetic disk logical sector allocation method and access method in accordance with the first preferred embodiment of the present invention.
2 1 1 1, Figure 2 is a block diagram showing the outlines of the construction of a sector servo method magnetic disk to which the same preferred embodiment is applied.
Figure 3 explains the logical sector allocation method and access method in magnetic disks using a sector servo method of a conventional type.
Figure 4 explains the problems with the conventional technology.
Detailed Description of the Preferred Embodiments
The preferred embodiments of the present invention will be explained with reference to the diagrams.
Figure 2 is a block diagram showing the outlines of the construction of a sector servo method magnetic disk to which the same preferred embodiment is applied. In this diagram, only the components relating to the present invention are shown.
On magnetic disk 1c, as Fig. l(b) shows, on the lower surface, the logical sectors are continuously allocated from the inner tracks to the outer tracks, while on the upper surface, the logical sectors are continuously allocated from the outer tracks to the inner tracks. In this case, on the lower surface, as shown in the diagram, logical sectors are continuously allocated from n+1 to n. In Fig. 2, magnetic disk lc is rotated by means of a spindle motor not shown in the diagram, and a pair of heads 2a and 2b are provided facing the upper and lower surfaces. In this case, although they are not shown, a number of magnetic disks aside from disk lc are provided, and a pair of heads are provided facing the upper and lower surfaces of each of the magnetic disks. Head actuator HA moves heads 2a and 2b with respect to magnetic disk lc based on a head actuator drive signal which is supplied to it. The data which are outputted by heads 2a and 2b are supplied to read/write circuit 4 through the medium of head switching circuit 3. The head switching circuit 3 alternatively selects between heads 2a and 2b based on a switching signal which is supplied to it. The read/write circuit 4 reads the read data which are supplied to it through the medium of head switching circuit 3 and generates a read signal. In addition, when writing, it reads the write data supplied by data control circuit 5 and generates a write signal. Furthermore, the read/write circuit 4 supplies a read signal to servo signal detection circuit 7 as well as servo data retrieval sequence circuit 8. The data control circuit 5 controls the writing and reading of-data. In addition, the data outputted from this data control circuit 5 are supplied to the external apparatus through the medium of interface circuit 6. The servo signal detection circuit 7 detects a servo signal from the read signal, generates a reset pulse, and supplies this to input end R of flip-flop 10 and one-shot timer 9. The timer value of one-shot timer 9 is set in accordance with the head of the sector which is being accessed, and the output of this is supplied to input end S of flip-flop 10. In this case, when the timer value outputted from one-shot timer 9 is supplied to input end S of flip-flop 10, the output end Q of this same flip-flop 10 is set to an "H" level, and this "H"-level signal is fed back into servo signal detection circuit 7 as a servo synch signal to detect the iiext servo signal. In addition, this is supplied at the same time to servo data retrieval sequence circuit 8. The servo data retrieval sequence circuit 8 distinguishes the servo data from the read signal of read/write circuit 4 based on the servo synch signal which is supplied to it and supplies these servo data to control circuit 11. The control circuit 11 comprises the CPU (Central Processing Unit) not shown in the diagram, the RAM (Random Access Memory), the ROM (Read Only Memory), and the interface circuit, etc.; a program which controls the CPU is written into the ROM. This control circuit 11, in order to extract the servo synch signal, sets one-shot timer 9 to a timer value corresponding to the memory area being accessed on magnetic disk lc based on the servo data which are supplied from servo data retrieval sequence circuit 8. Furthermore, a switching signal is supplied as necessary to head switching circuit 3 in control circuit 11. In addition, 4 1 1 a head actuator drive signal is supplied to head actuator HA.
A logical sector allocation method in accordance with this preferred embodiment will now be explained with reference to Fig. 1. Heads 2a and 2b shown in the diagram correspond to heads m and m+l shown in Diagram l(a). Furthermore, head m+l is placed on logical sectors 13-16. The control circuit 11 drives head actuator HA; as shown in Fig. l(b), logical sectors (13-16) are first allocated in order on track n by means of head m+1. Next, logical sectors (17-20) are allocated in order on track n+l. After this, logical sectors (97-100) are allocated, seeking one track at a time in the direction of the outer circumference of magnetic disk 1c, to track n+x of the outer edge of the lower surface of magnetic disk 1c. After the allocation of logical sector 100 on track n+x, control circuit 11 supplies a switching signal to head switching circuit 3, and the head is switched from m+l to m. In this case, as the head is inclined, head m is not positioned on track n+x. In order to compensate for this inclination, seeking is conducted as far as track n+x. In addition, when track n+x is reached, logical sectors (101-104) are allocated in order from the inner circumference of track n+x towards the outer circumference. After this, in the same way, seeking is conducted one track at a time in the direction of the inner circumference, and the allocation of the logical sectors is carried out.
In this way, after the allocation of logical sectors on the lower surface of magnetic disk 1c, logical sectors are allocated on upper surface of magnetic disk 1c, so that in the case in which logical sectors are continuously accessed, with the exception of the outer circumference of magnetic disk lc where head switching is carried out, the positioning of the heads is completed after single-track seeking. Accordingly, in comparison with a conventional system in which each time the head is switched multi-track seeking must be carried out to position the head, the access time is shortened.
4 (other Embodiments) In the preferred embodiment described above, the allocation of logical sectors on the lower surface of magnetic disk lc was carried out from the inner circumference to the outer circumference; however, it is permissible to allocate in the opposite direction, from the outer circumference to the inner circumference. In this case, it is obvious that logical sectors would be continuously allocated on the upper surface of magnetic disk lc from the inner circumference in the direction of the outer circumference.
Furthermore, in the preferred embodiment described above, logical sector allocation took place on both surfaces of magnetic disk lc, however, it is acceptable to allocate logical sectors on a number of magnetic disks. For example, logical sector allocation could be continuously carried out on the lower surface of magnetic disk lc, and then logical sector allocation could be carried out on the upper surface of another magnetic disk from the outer circumference to the inner circumference.
il t- 6 i
Claims (6)
1. A method of allocating the logical sectors of a magnetic disk apparatus which comprises the steps of first carrying out the continuous allocation of logical sectors on one surface of a magnetic disk from the inner circumference to the outer circumference, and then carrying out the continuous allocation of logical sectors on the other surface of the magnetic disk from the outer circumference to the inner circumference.
2. A method of allocating the logical sectors of a magnetic disk apparatus which comprises the steps of first carrying out the continuous allocation of logical sectors on one surface of a magnetic disk from the outer circumference to the inner circumference, and then carrying out the continuous allocation of logical sectors on the other surface of the magnetic disk from the inner circumference to the outer circumference.
3. A method of allocating the logical sectors of a magnetic disk apparatus which comprises the steps of first carrying out the continuous allocation of logical sectors on one selected surface of a magnetic disk selected from a group consisting of a number of magnetic disks from the inner circumference to the outer circumference thereof, and then carrying out the continuous allocation of logical sectors on one selected surface of another magnetic disk from the outer circumference to the inner circumference thereof.
4. A method of allocating the logical sectors of a magnetic disk apparatus which comprises the steps of first carrying out the continuous allocation of logical sectors on one selected surface of a magnetic disk selected from a group consisting of a number of magnetic disks from the outer circumference to the inner circumference thereof, and then carrying out the continuous allocation of logical sectors on one selected surface of another magnetic disk from the inner 7 i circumference to the outer circumference thereof.
5. A logical sector access method for a magnetic disk apparatus, characterized in that the heads are accessed based on logical sectors which are allocated on a magnetic disk by means of the said method of allocating the logical sectors of a magnetic disk apparatus.
6. A method of allocating the logical-sectors of a magnetic disk apparatus substantially as herein described with reference to and as shown in the accompanying drawings.
k 8 Published 1991 atThe Patent Office. State House. 66/71 High Holborn, LondonWCIR4111. Further copies Tnay be obtained frorn Sales Branch. Unit 6. Nine Mile Point, Cwmfelinfach. Cross Keys. Newport. NPI 7HZ. Printed by Multiplex techniques lid. St Mary Cray, Kent
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18834589A JPH0352167A (en) | 1989-07-20 | 1989-07-20 | Allocation method and access method for logical sector of magnetic disk device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9015859D0 GB9015859D0 (en) | 1990-09-05 |
| GB2235565A true GB2235565A (en) | 1991-03-06 |
Family
ID=16221995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9015859A Withdrawn GB2235565A (en) | 1989-07-20 | 1990-07-19 | Method of allocation of logical sectors in a magnetic disk apparatus and an access method therefor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0352167A (en) |
| DE (1) | DE4023148A1 (en) |
| GB (1) | GB2235565A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5966721A (en) * | 1995-06-26 | 1999-10-12 | Hitachi, Ltd. | Digital signal recording method and disk reproducing apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19655115B4 (en) * | 1995-06-26 | 2006-02-02 | Hitachi, Ltd. | Optical disc recording method for digital data - storing data frames on both sides of discs formed in data blocks with first block providing control information |
-
1989
- 1989-07-20 JP JP18834589A patent/JPH0352167A/en active Pending
-
1990
- 1990-07-19 GB GB9015859A patent/GB2235565A/en not_active Withdrawn
- 1990-07-20 DE DE19904023148 patent/DE4023148A1/en not_active Ceased
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5966721A (en) * | 1995-06-26 | 1999-10-12 | Hitachi, Ltd. | Digital signal recording method and disk reproducing apparatus |
| US6076135A (en) * | 1995-06-26 | 2000-06-13 | Hitachi, Ltd. | Information medium having a plurality of recording surfaces |
| US6154806A (en) * | 1995-06-26 | 2000-11-28 | Hitachi, Ltd. | Method for recording digital signals on multiple-layered disks |
| US6233649B1 (en) | 1995-06-26 | 2001-05-15 | Hitachi, Ltd. | Digital signal reproducing method |
| US6324618B1 (en) | 1995-06-26 | 2001-11-27 | Hitachi, Ltd. | Optical disk reproducing apparatus |
| US6332174B1 (en) | 1995-06-26 | 2001-12-18 | Hitachi, Ltd. | Digital signal reproducing apparatus |
| US6347353B1 (en) | 1995-06-26 | 2002-02-12 | Hitachi, Ltd. | Information medium having digital signals recorded thereon |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0352167A (en) | 1991-03-06 |
| DE4023148A1 (en) | 1991-01-31 |
| GB9015859D0 (en) | 1990-09-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |