JPH03119569A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform switching in an optimum position by designating a switching track of the write current and read channel characteristic based on track position detection of a head with respect to each of both faces of a disk in a device using both faces of the disk. CONSTITUTION:An up/down counter 1 counts step pulses corresponding to a step pulse signal and a step direction signal to detect the track position of the head. A switching signal is supplied from a magnitude comparator 2 or 3 to which the detection signal and an inner/outer periphery switching track for face 0 or inner/outer periphery switching track for face 1 are supplied, and a switching signal for face 0 or 1 is outputted through a selecting circuit 4 controlled by a face 0/1 switching signal to switch the write current and the reed filter characteristic. Consequently, a switching track is designated for each face, and switching in an optimum position is possible regardless of difference of the recording density or the like, and a high-density both face disk recording and reproducing device of high reliability is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] The present invention is a disk recording/reproducing device, in particular, a device for writing data on both sides of a rotating disk-shaped recording medium using a magnetic head, a pickup, etc. according to a predetermined signal method. ,
Or it relates to a recording and reproducing device that reads out and outputs it to the outside.

[Prior Art] Various disk recording and reproducing devices, including floppy disk devices, have been widely used as external storage devices for computers and word processors.

This type of device uses a magnetic head or the like on the surface of a rotating disk to write and read signals concentrically or spirally.

At this time, if the disk rotates at a constant speed, the linear velocity will be different between the inner and outer circumference of the disk.
It has been known for some time that the recording density of signals is higher at the inner periphery, and that some kind of correction is required. In conventional methods, as a countermeasure for high-density recording, the write current is reduced from a certain position (track) to the inner periphery, and the resolution of the read channel characteristics is increased. In this way, it is necessary to change various characteristics at a certain recording density.

On the other hand, in the case of a double-sided recording type magnetic disk device, the surface 0 head and the surface 1 head are not located at the same facing position due to the structure, and the surface 1 head is located on the inner circumferential side by 4 to 8 tracks. Therefore, even for tracks with the same number, the head position on the first side is on the inner circumference. In addition, the position where the write current and read channel characteristics on the inner circumferential side are switched is specified by the track number, so
If you switch at the optimal position based on the 0th side, the 1st side will be at a position on the inner periphery.

FIG. 2 shows a conventional double-sided magnetic disk drive.

A step pulse signal SP and a step direction signal SD for performing a head seek to send the head to a predetermined track on the disk are counted by an up/down counter 8 to determine the head position. A magnitude comparator 9 compares the signal of this counter 8 with a track number T preset as a write current and read channel characteristic switching track, and based on the comparison output signal 10, a write current generator 11 and a read filter 12, and as a result, the write current and read channel characteristics are switched.

As a result, the write circuit 13 and the read circuit 14 perform writing and reading, respectively, with write current and read channel characteristics depending on the inner and outer peripheral positions of the disk.

[Problems to be Solved by the Invention] However, in the conventional method, as mentioned above, there is a deviation in the head position, so it is necessary to switch the write current and read channel characteristics at the positions where the recording density differs between the 0th surface and the 1st surface. No. In other words, it is impossible to switch the characteristics at the optimal position for both the 0th surface and the 1st surface. Therefore, 0
In addition to variations in characteristics occurring between the two sides and the first side, recording and reproduction cannot be performed on both sides in an optimal state.

An object of the present invention is to solve the above problems and provide a more reliable and high-density double-sided disk type recording/reproducing device.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and is characterized by a disc recording/reproducing device that records or reproduces data on both sides of a disc-shaped recording medium. a detection means capable of detecting a track position of a head on the disk-shaped recording medium on each recording surface of the disk-shaped recording medium; and a head position of the detection means corresponding to the recording surface of the disk-shaped recording medium. A disc recording/reproducing apparatus includes a correction means for switching recording or reproducing characteristics based on detected information.

Further, the present invention is characterized in that a disk recording/reproducing apparatus is provided which performs recording or reproduction on both sides of a disk-shaped recording medium, and in which the head positions on each recording surface of the disk-shaped recording medium are different from each other. detecting means capable of detecting track positions on opposing recording surfaces; and when recording or reproducing on the disk-shaped recording medium, recording or reproducing is performed based on head position detection information by the detecting means corresponding to the recording surface. A disc recording/reproducing apparatus includes a correction means for switching characteristics.

As a result, the write current of the double-sided disk recording/playback device,
Switching tracks for read channel characteristics, etc. can be specified for each side, allowing switching at the optimal position.

[Example] Hereinafter, a case where the recording/reproducing apparatus according to the present invention is applied to the magnetic recording/reproducing apparatus shown in FIG. 1 will be described in detail.

Note that the same reference numerals are used for the same components as in FIG. 2, and the description thereof will be omitted. A head seek step pulse (i number SP) and a step direction signal SD supplied from a control circuit (not shown) are counted by an up/down counter 1 to determine the head position. and 3 for one side separately, and set the write current switching track independently on each side,
Switch the signal at the optimal track position on the disc. This is selected by the signals of the 0th and 1st sides and the selection circuit 4, and inputted to the voltage switching terminal 5 of the write current generator 6. As a result, the current generator selects and generates currents for the inner circumference and the outer circumference.

Similarly to the method described above, the read channel characteristics are switched by manually inputting an inner/outer circumference switching signal to the read filter 7.

That is, a 0/1 side switching signal DS for specifying the side of the disc to be recorded or played back is supplied from a control circuit (not shown) to the selection circuit 4, and the selection circuit 4 selects the magnetic field based on this signal. Dude converters 2 and 3 are selectively switched.

In other words, the magnitude comparator 2 for detecting the 0 side
is the inner/outer circumference switching track designation signal T on the 0 side. A head position output signal from the up/down counter 1 indicating the head position is supplied, and both are compared and a signal for switching the inner and outer peripheral characteristics on the 0 side is output.

In addition, the magnetic converter 3 for detection on the first side has
Since the head positions are different on the 0th side and the 1st side, the inner and outer circumference switching track designation signal T1 on the 1st side and the \rad position output signal of the uptown counter 1, which does not indicate the head position, are supplied and compared. A signal for switching the inner and outer peripheral characteristics on the first surface side is output.

The outputs of these magnitude comparators 2 and 3 are supplied to a selection circuit 4, and the output of the magnitude comparator on the side corresponding to the disk surface on which recording or playback is performed is selected and applied to the subsequent write current generator 6 or read filter. 7.

In other words, when the 0/1 side switching signal DS is at Hi level,
The gate of the AND circuit A1 in the selection circuit 4 is opened, and the gate of the AND circuit A2 is closed by the NOT circuit. As a result, the output of the magnitude comparator 2 for O-side detection is supplied to the write current generator 6 during writing and to the read filter 7 during reading through the AND circuit AI and OR circuit, respectively, and the characteristics are switched according to the head position. will be held. Thereafter, optimal recording or optimal reproduction can be performed on the designated track of the disc via the write circuit 13 or the read circuit 14, respectively.

The embodiments described above have a hardware configuration, or if a microcomputer is used for control, the same operation can be performed by changing the software.

In the embodiment described above, the output of the magnitude comparator is shared by the write current and the read filter, but by providing each with an independent magnitude comparator, it is also possible to perform switching with higher precision.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, both sides of a double-sided disk type recording/reproducing device can be written at optimal positions.
Current and REIT channel characteristics can be switched, enabling more reliable and high-density recording and playback.

[Brief explanation of drawings]

FIG. 1 is a block diagram for switching write current and read channel characteristics according to the present invention. Figure 2 is a block diagram of conventional write current and read channel characteristic switching.

Claims (2)

[Claims] (1) A disk recording and reproducing device that records or reproduces data on both sides of a disk-shaped recording medium, wherein the track position of a head on the disk-shaped recording medium can be detected on each recording surface of the disk-shaped recording medium. and a correction means for switching recording or reproducing characteristics based on head position detection information of the detecting means corresponding to the recording surface of the disc-shaped recording medium. (2) A disk recording/reproducing device that records or reproduces data on both sides of a disk-shaped recording medium, and in which the head positions on each recording surface of the disk-shaped recording medium are different from each other, wherein the respective heads track tracks on the opposing recording surfaces. a detection means capable of detecting each position; and a correction means for switching recording or reproduction characteristics based on head position detection information by the detection means corresponding to the recording surface when recording or reproducing on the disk-shaped recording medium. What is claimed is: 1. A disc recording/playback device comprising: