JPH0430375A - Method for accessing disk - Google Patents

Abstract

PURPOSE:To stably access a disk at high speed by executing head transfer with positional data peculiar to a zone not by the positional data of address corresponding stored in a memory. CONSTITUTION:When it is access to an address within the normal area of a disk face, a control part 11 sets logical positional data read from a ROM 12 or from a RAM 13 to a linear motor driving part 9 as positional data and indicates head transfer. The control part 11 reads the address read from a disk at a position where the transfer is finished from an address reading part 10 and completes accessing to the assigned address. On the other hand, when the assigned address belongs to an inner peripheral zone or to an outer peripheral zone, the control part 11 selects the above positional data peculiar to zone for the positional data, sets them to the linear motor driving part 9 and makes it execute the head transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disk access method in an apparatus for recording and reproducing information using a disk (for example, an optical disk) as an information recording medium.

2. Description of the Related Art Conventionally, in this type of information recording and reproducing apparatus, position data corresponding to each address on a disk is calculated logically in advance, and the position data is stored in a non-rewritable memory (ROM) or a rewritable memory 1.1 (RAM). ) as a table,
When access to a certain address is specified, the position data corresponding to this specified address is read from memory,
A disk access method was used in which the head was moved according to this position data.

More specifically, the difference between the current head position data (potentiometer detection current or voltage) detected by a potentiometer linked to head movement and the position data corresponding to a specified address read from memory is the minimum. In order to do this, a linear motor, etc. for moving the head was driven.

A more practical flow of conventional disk access processing is explained in Part 5.
As shown in the figure. First, the process of moving the head according to the position data in the memory corresponding to the specified address as described above is performed (part A), and at the position where this head movement is completed, the necessary data is transferred based on the address read from the disk. A track jump is performed (part B), and the address read from the disk is checked (part C).

Problems to be Solved by the Invention However, according to the conventional disk access method as described above, the access time may increase or access may become impossible. The reason for this will be explained next.

The position data stored in memory is calculated logically according to certain standard conditions.

However, even if the positioning of the potentiometer, etc. for head position detection is done accurately for a given disk, the diameter and shape of the center hole vary from disk to disk, so when the disk is replaced, the position may shift. It will happen. Further, the influence of friction in the head transfer system inevitably varies from device to device, and also changes over time, which can also cause positional deviation. Because of this positional deviation, when accessing the innermost or outermost circumference of the disk, if the head is moved according to the position data in the memory corresponding to the specified address, the recording film or track groove on the disk As a result, the servo system for moving and tracking the head becomes unstable or oscillates and becomes uncontrollable, resulting in the above-mentioned problems.

The present invention was made in view of these problems, and
An object of the present invention is to provide a disk access method that allows stable and high-speed access to the innermost and outermost portions of a disk.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a memory that stores position data corresponding to each address on a disk, and also has a memory that stores position data corresponding to each address on a disk. If multiple address ranges in the innermost and outermost zones are set as the inner zone and outer zone, and access to an address that does not belong to either the inner zone or the outer zone is specified, this specified address will be supported. The address for recording or reproducing information on the disk is transferred according to the position data in the memory, but if access to an address belonging to the inner zone or the outer zone is specified, the address to which it belongs is transferred. The head is moved according to positional data specific to the inner circumferential zone or the outer circumferential zone.

Effect: According to the above-described disk access method of the present invention, by appropriately determining the widths of the inner zone and the outer zone and positional data specific to each zone, it is possible to easily replace disks and adjust the transfer system for each device. Regardless of positional deviations due to variations in friction or changes over time, this prevents the head from jumping out into areas where there is no recording film or track grooves when accessing the innermost and outermost areas, ensuring stable and high speed operation. Disk access becomes possible.

Embodiment FIG. 1 is a functional configuration diagram related to disk access of an information recording/reproducing apparatus according to an embodiment of the present invention.

1 is a disk drive unit. As shown in FIG. 2, this includes a disk motor 3 that rotates a replaceable disk 2 (for example, an optical disk), a head 4 (for example, an optical head) that records and reproduces information on the disk 2,
A head transfer unit 5 consisting of a linear motor and the like for transferring the head 4 in the radial direction of the disk 2;
It is composed of a potentiometer for detecting the throat position (not shown) and other mechanisms that are linked to the movement of the nozzle.

8 is a disk motor drive unit that drives the disk motor 3 of the DistaDry Life Uninote 1; 9 is a linear motor drive unit that drives the linear motor of the head transfer unit 5;
0 is an address read section that separates and reads address information from the reproduction signal of the head 4; 11#'i is a control section (CPU) that controls disk access and communicates with the outside; 1;
2 and 13 are R accessed by the control unit 11, respectively.
A table of position data for disk access is stored in the OM and RAM.

An example of this position data table is shown in the table below.

Position data table 1 in the margin below is logical position data corresponding to each address (track address), which is calculated according to standard conditions and stored in the ROM 13 ( Alternatively, the RA is calculated by software at power-on.
M13).

However, this logical position data takes the same value for multiple addresses. Therefore, one row of Table 1 generally corresponds to n consecutive addresses (n tracks).

Position data (2) is position data used for actual disk access. The position data A specific to the inner sea/ is the logical position data (
=5) is selected. The position data B specific to the outer zone is the position data (
=50) is selected. The position data of the normal area, which is neither the inner zone nor the outer zone, is the same as the logical position data.

FIG. 3 shows the structure of the disk surface. 14 is normal area, 1
6 is an inner circumferential zone, and 17 is an outer circumferential zone, and these are areas where information can be recorded. Reference numeral 15 denotes an area where no recording is possible because there is no recording film or track groove.

Hereinafter, the disk access method will be described along with No. 4N, which is a flowchart of disk access processing.

When an access request to a certain address occurs, the control unit 11 takes the logical position corresponding to this designated address (
Store the position data (■) in Table 1 in ROM12 or RAM
ST 1 in FIG. 4 read from 13. ), it is checked whether the value of this logical position data corresponds to the inner seam 716 or the outer seam 17 (Sr1,5T
3). That is, it is checked from the value of the logical position data whether the designated address belongs to the inner zone 16 or the outer zone 17.

If it is determined that it does not belong to either the inner zone 16 or the outer zone 17, that is, the normal area 14 on the disk surface.
If the access is to an address within R, the control unit 11
The logical position data read out by the OM 12 or the RAM 13 is set as position data in the linear motor drive section 9 to instruct head movement (Sr1).

The linear motor drive section 9 includes a disk drive unit 1
The linear motor of the head transfer unit 5 is driven so that the difference between the position data detected by the potentiometer of the disk drive unit l and the position data set by the control unit 11 is minimized (Sr1.Sr1, 5).
T9).

The control unit 11 sends the address read from the disk 2 at the position where this head movement is completed to the address read unit 10.
Then, the track jump and address check similar to those in parts B and C of the flowchart in FIG. 5 are performed (ST11 color 5T16), and access to the designated address is completed.

On the other hand, if the designated address is an address belonging to the inner zone 16 or the outer zone 17, the control unit 11 selects the zone-specific position data A or B as the position data (Sr
1 or 5T5) and set it in the linear motor drive unit 9 to move the head (Sr1.Sr1.Sr1.
5T9).

The unique position data A or B of each zone 16 or 17 is selected to be the same as the logical position data corresponding to the outermost or innermost address of each zone 16 or 17, as described above. Even if there are variations in system friction, etc., it is possible to prevent the servo system from oscillating due to the head protruding into the area 15 where there is no recording film or track groove.

The subsequent processing is the same as that for accessing the normal area 14.

Effects of the Invention As is clear from the above explanation, when accessing an address belonging to a preset inner zone or outer zone on a disk, the present invention provides access to an address that belongs to a preset inner zone or outer zone, regardless of the location data corresponding to the address stored in the memory. By performing head movement using zone-specific position data, when accessing the innermost or outermost periphery of a disk, variations in center hole diameter and shape for each disk and head movement for each device can be avoided. This absorbs the effects of variations in diameter friction and changes over time, and prevents the head from jumping out into areas where the recording film does not yet have track grooves, which would cause the servo system to oscillate and become uncontrollable due to instability. This has the effect of enabling more stable and faster disk access than conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a functional configuration diagram related to disk access of an information recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a disk drive unit, FIG. 3 is a configuration diagram of a disk surface, and FIG. FIG. 5 is a flowchart of disk access processing in the same embodiment, and FIG. 5 is a flowchart of conventional disk access processing. DESCRIPTION OF SYMBOLS 1... Disk drive unit, 2... Disk, 4... Head, 5... Head transfer unit, 9...
・Linear motor drive section, 10...address lead section,
11...Control unit, 12...ROM, 13...RAM
, 14... Normal area, 15... Area without recording film or track groove, 16... Inner circumferential zone, 17... Outer circumferential zone. Name of agent Patent attorney Shigetaka Awano and 1 other person Tisk Life 22 Noto Disc motor drive unit Linear motor drive unit Address read unit Control unit Non-rewritable memory (ROM) Rewritable memory (RAM) 3. Disc motor 4- Head 5/transfer unit diagram

Claims (1)

[Claims] It has a memory that stores position data corresponding to each address on the disk, and is set in advance on the disk.
When access to an address that does not belong to either the inner zone or the outer zone, each of which is made up of multiple addresses, is specified, recording or reproduction of information on the disk is performed according to the position data in the memory corresponding to this specified address. When access to an address belonging to the inner zone or the outer zone is specified, the head is moved according to position data specific to the inner zone or the outer zone to which the head belongs. A disk access method in a device that records or reproduces information using a disk as a recording medium.