JPS626407A - Disk driving device - Google Patents

Abstract

PURPOSE:To improve the efficiency of a format by providing a delay means for delaying an erase gate signal for turning on/off a tonnel erase head from a write gate signal for turning on/off a recording/reproducing head by a time corresponding to respective detected outputs of a detecting means. CONSTITUTION:Respective delay lines 41-4n delay a write gate signal S2 by respective inherent delay times and output erase gate signals S1. The signals S1 are supplied to an AND gate circuit 15 to control the gate of the circuit 15. On the other hand, erase current is supplied from an erasing circuit 16 to the circuit 15 and the erase current is supplied to an E head 2 only for a period that the gate is opened to executed tonnel erasing. Thereby, the erase gate signals S1 obtained by delaying the write gate signal S2 only by the delay time in each cylinder are obtained. Consequently, the efficiency of the format is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disk drive device used as an external storage device for computers and the like, and particularly to realize high-density and large-capacity recording on disks.

(Prior Art) In general, information signals are sent and received to and from a flexible sheet-like disk on which various signals are recorded as shown in FIG. 4, as shown in FIG. 1), the process is performed for a predetermined data field while reproducing the index address mark, cylinder number, etc. recorded in advance in the ID field.

In addition, the disk drive device that sends and receives signals to and from the disk has tunnels in front and on both sides of the R/W head 1 in the disk rotation direction (in the direction of the arrow), as shown in FIG.・Erase head (hereinafter referred to as “
A C/N (C
It has become possible to improve compatibility with other disk drive devices.

Here, as described above, the E head 2 is operated by the R/W head 1 in order to prevent mutual magnetic interference with the R/W head 1.
/W It is arranged so as to be located at the rear of the head 1.

Therefore, in order to erase only the unnecessary signals on both sides of the data field by this E head 2, the on/off timing of this E head 2 is set to the above R/W head 1.
It is set to be delayed from the on/off timing of the

Further, the delay time t of the E head 2 with respect to the R/W head 1 is calculated by dividing the angular velocity of the disk by ω, the radius of the disk (head position), and the gap of the E head 2 (hereinafter referred to as "E gap"). The gap between 2G and the R/W head 1 (hereinafter referred to as rR/W gap) can be expressed by the following equation, where L is the distance from IG. Therefore, this delay time t is equal to R on the disk when the angular velocity ω is constant.
/W varies depending on the radial position of the head 1, and the outer circumferential side of the disk becomes shorter.

Therefore, conventionally, GAP2 of a length that can cover the longest delay time t at the innermost radius is provided as a buffer area between the ID field and the data field of each sector. , it was designed to absorb the deviation in the on/off timing of the E head 2 on the outer periphery.

(Problems to be Solved by the Invention) With the recent trend towards higher density and larger capacity, it has been proposed to increase the number of sectors in each track. In such a device, the above G
It is necessary to provide AP2, and as the number of sectors increases as the capacity increases, the effective data field is deleted, reducing format efficiency, which hinders the ability to increase the capacity of the disk. there were.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned circumstances, and aims to improve format efficiency by shortening GAP2 as much as possible, thereby enabling high-density recording. The purpose is to provide a disk drive device.

In order to achieve this object, the present invention provides a R/W head 1 that slides on a disk rotated in a predetermined direction as described above and sends and receives information signals to the data field of this disk. In a disk drive device equipped with an E head 2 which is disposed in front of and on both sides of the R/W head with respect to the predetermined direction and erases unnecessary signals on both sides of the data field, as shown in FIG. A detection means 3 that detects the radial position of the R/W head 1 with respect to the disk and an erase gate signal s1 that turns on and off the E head 2 are used to turn on and off the R/W head 2.
The detection means 3 detects when the write gate signal S2 turns off.
A delay means 4 is provided for delaying the detection output S3 by a time corresponding to the detected output S3.

(Function) According to the disk drive device configured as described above, the delay time t of the erase gate signal S1 with respect to the write gate signal S2 is variably set as appropriate depending on the radial position of the R/W head 1 with respect to the disk. .

Therefore, according to the present invention, the number of GAP2 bytes can be set to the minimum necessary to absorb the difference in the delay time t between the inner and outer sides of the disk, and format efficiency can be improved. .

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail using FIGS. 1 to 3.

FIG. 1 is a block circuit diagram showing the electrical configuration of a disk drive device according to this embodiment, and this disk drive device is connected to a host i (not shown) via an input/output port 5.
It is designed to exchange signals with the i controller.

That is, the information signal input terminal 6 of the input/output board 5 is supplied with the information signal SD from the controller, and this information signal So is supplied to the first AND gate 7. A write gate signal S is also input to the AND gate circuit 7 via a write gate input terminal 8.
2 is supplied, and the first A N D gate 8 circuit 7 is opened during the period when this gate signal S2 is at logic "0", whereby the information signal So is supplied to the R/W head 1. is supplied to .

Note that the information signal SD reproduced by this R/W head 1
And other indexes, address marks, etc.
The signal is supplied to the controller via an output terminal 9 constituting the input/output board 5. The R/W head 1 and the E head 2 are supplied with a head select signal S4 from the controller via the head select signal supply terminal 10 of the input/output board 5.

On the other hand, the step pulse input terminal 1 of the input/output board 5
The step pulse P supplied to the access motor 13 is supplied to the access motor 13 via the drive circuit 12.

Similarly, the direction signal S5 supplied to the direction signal input terminal 14 is also supplied to the drive circuit 12. Note that the step pulse P is
The access motor 13 is driven to rotate for one track, and the R/W head 1 moves one track for each step pulse P. Also,
The above-mentioned direction signal S5 specifies the moving direction of the R/W head 1, and when this signal S5 is logic "0", the moving direction of the R/W head 1 is specified to one direction toward the inner side of the disk, and the logic When it is "1", one direction of the outer side is specified.

The step pulse P1 and the direction signal S5 as described above are transmitted to CPU (Cen.
tral Processor Unit) 3. This CPU 3 increments or decrements the contents of a built-in counter according to the supplied step pulse P and direction signal S5. That is, in this embodiment, the content of the counter is incremented by the number of pulses of the step pulse P when the direction signal S5 is at logic "O" to specify the inner direction as the head movement direction. It is decremented when the direction signal S5 is at logic "1" (when specifying one outer direction as the head movement direction). Here, the contents of this counter are always "0" in the initial state when the disk is inserted, and the result of the above-mentioned increment or decrement is the radial position of the R/W head 1 on the disk, That is, it corresponds to the cylinder number in which the R/W head 1 is located.

Then, as shown in the figure, the CPU 3 corresponds to the content of the counter, for example, if the content of the counter is "3",
Corresponding to this "3", a detection output 83 (binary signal) is output from the third output terminal 33 of the CPU 3.

Then, any output terminal 31, 32, 33...3
The detection output S3 outputted from n is supplied to delay means 4 constituting the present invention.

In this embodiment, the delay means 4 is composed of delay lines 41, 42, 43, . , 42.43.4n has the above CP
The detection output S3 is supplied from each output terminal 31, 32, 33, . . . 3n of U3. Further, the write gate signal S2 is supplied to each of these delay lines 41, 42, 43, . . . 4n.

Each of these delay lines 41, 42, 43, . . . 4n delays the write gate signal S2 by a specific delay time t, as shown in FIG.
Output.

Here, each of the above delay times t is calculated and determined from the above formula, and each of these delay times t is calculated from when the R/W gap 1G is located at the front part of the data field to when the E cap 2G is located at the front part of the data field. It is set slightly shorter than the time required to reach the front part of this data field. Note that this delay time t is when the R/W head 1
This is also the processing time during which the D information is read and the controller issues instructions based on this ID information.

Then, the erase gate signal $1 generated in this way
is supplied to the second AND gate circuit 15, and performs the gate t/J III of this gate circuit 15.

The AND gate circuit 15 also includes an erase circuit 1
An erase current is supplied from E head 6, and this erase current is supplied to the E head 2 only during the period when the gate is open, and tunnel erase is performed only during this period.

In this way, according to this embodiment, the write gate signal S2
It is possible to obtain the erase gate signal S1 delayed by the delay time t for each cylinder.

This makes it possible to obtain the optimum tunnel erase on/off timing for each cylinder.

Therefore, the length of GAP2 for absorbing this timing shift due to the disc diameter difference can be minimized, and the occupation rate of GAP2 in each sector can be reduced.

Therefore, formatting efficiency in this type of disk drive device can be improved, and high-density, large-capacity recording can be realized.

In particular, since GAP2 is absolutely necessary for all sectors, the effect of shortening the length of GAP2 becomes more pronounced as the number of sectors per track increases as the capacity increases.

That is, as a result of the applicant's experiments, the diameter of the outermost cylinder of the disk is 89111S! The diameter of the inner cylinder is 49m5. The recording density is approximately 41 BPI, and the data length is 3rd.
As shown in the figure, the disk with < 512 bytes is 120
When rotating at high speed at 0 rpm, the number of GAP2 bytes could be kept to about 12 ayte, and as a result, the number of 45 sectors on each track could be increased to 48. Therefore, formatting efficiency can be improved by about 6-7%.

Incidentally, in the embodiments described above, the delay time t is variably set for each cylinder, but in the disk drive device according to the present invention, for example, all the cylinders are evenly divided into a plurality of cylinders, and each The delay time 21 as described above may be set for each cylinder unit. That is, for example, the applicant of the present application divided all cylinders into Mikasa parts and conducted an experiment under the above conditions, and as a result, was able to suppress GAP2 to 22 Bytes, and thereby was able to reduce the number of sectors from 45 to 47. Therefore, in this case, formatting efficiency can be improved by 3 to 4%.

(Effects of the Invention) As is clear from the above description, according to the present invention, the tunnel erase is turned on and off by generating the erase gate signal by delaying the write gate signal by the delay time specific to each cylinder. By controlling the timing of GAP2, the length of GAP2 in each sector can be shortened.

Therefore, the present invention improves the GAP per track when the number of sectors increases as the capacity of a special disk increases.
The number of bytes of 2 can be significantly reduced, which makes it possible to further increase the number of sectors, and
The number of bytes (data length) of the data field in each sector can be increased, and format efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing the electrical configuration of an embodiment according to the present invention, FIG. 2 is a time chart, and FIG. 3 is a signal format realized by the disk drive device of the embodiment shown in FIG. FIG. 4 is a diagram schematically showing a general signal format, and FIG. 5 is a diagram schematically showing tunnel erase. 1... Recording/reproducing head (R/W head), 2...
Tunnel erase head (E head), 3...
Detection means (CPU), 4... Delay means. Patent Applicant: Victor Japan Co., Ltd. 6 Representative: Shinji Shinji (partially “I..., PA; Procedural amendment writing method)” October 21, 1985

Claims (1)

[Scope of Claims] A recording/reproducing head that slides in contact with a disk that is rotationally driven in a predetermined direction and transmitting and receiving information signals to a data field of the disk, and a recording/reproducing head that is in sliding contact with a disk that is rotationally driven in a predetermined direction, and a recording/reproducing head that is in sliding contact with a disk that is rotationally driven in a predetermined direction and transmits and receives an information signal to a data field of the disk; Tunnels are placed in front and on both sides to erase unnecessary signals on both sides of the data field.
a detection means for detecting a radial position of the recording/reproducing head with respect to the disk; and an erase gate signal for turning on/off the tunnel erase head to the recording/reproducing head. A disk drive device comprising a delay means for delaying a write gate signal for turning on and off by a time corresponding to the detection output of the detection means.