JPS62128069A - Disk control device - Google Patents

Abstract

PURPOSE:To decrease the occurring frequency of the error of data replacement by discriminating the track form of a using disk, executing the data writing/ reading control at one track unit at the time of a double track form and executing the writing/reading control of the data at two track units at the time of a signal track form. CONSTITUTION:In the disk drive for a double track, it is discriminated whether the using disk is a double track form or a single track form. At the time of the double track form, the writing/reading control is executed for the data by one track unit and at the time of the single track form, the writing/reading control is executed for the data by two track units. Thus, the occurring frequency of the error at the time of executing the data replacement by the disk of the single track can be decreased between a double track disk drive and the single track disk drive.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disk control device for a double track disk drive that is capable of handling single track type disks.

[Technical background of the invention and its problems]

One type of technology for increasing the capacity of floppy disks is the double track system.

This double-track system doubles the number of tracks by narrowing the track width to half that of the conventional single-track system, thereby doubling the disk capacity. FIG. 4 shows a comparison of the track formats in the single track system and the double track system at this time. Note that the numbers in the figure are track numbers, and D indicates the disc.

In this double-track disk drive, the recording width of the data input/output head (read/write head) is made equal to the track width, making it 1/2 that of the conventional single-track disk drive.

Here, a device that handles a single-track type disk is called a single-track disk drive, and a device that handles a double-track type disk is called a double-track disk drive.

Here, when inputting/outputting (reading/writing) a single track type disk with a double track disk drive, conventionally a method has been adopted in which input/output is performed while the head seeks every other track.

That is, among the tracks with track numbers 2n+0 and 2n+1, a method is adopted in which data is input/output only to the track with track number 2n-ho, and data is not input/output to track Kii-i with track number 2n+l. It is being This means that data can be input and output using only 1/2 the track width of a single track.

Therefore, in the past, when data was exchanged between a double track disk drive and a single track disk drive using a single track disk, there was a problem in that errors occurred frequently. %, when reading a disc with data output every other track as described above using a single track drive, the data is stored only on track 1, which is 1/2 of the original track, so errors in the read data may occur. There is a problem that the occurrence frequency is high.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and by improving the data input/output means for the single track disk in the double track disk drive, it is possible to transfer data between the double track disk drive and the single track disk drive. An object of the present invention is to provide a disk control device that reduces the frequency of errors occurring during data exchange.

[Summary of the invention]

The present invention, in a double-track disk drive, determines whether the disk being used is a double-track format or a single-track format, and when the disk is in a double-track format, controls data writing/reading in units of one track. When the single-track format is used, data is written/read in units of two tracks, and this allows data to be exchanged between a double-track disk drive and a single-track disk drive using a single-track disk. The frequency of occurrence of errors can be reduced, and data exchange between the double track disk drive and the single track disk drive can be performed with high reliability.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a device according to the present invention. In the figure, I is a seek circuit that positions the head (HD) on a target track. 2 is an input/output circuit for inputting/outputting data (read/write) to the track. A control device 3 receives requests from the host device, controls the head position, and requests the input/output circuit 2 to input and output data. 4 is a double track disk drive. The controller 3 recognizes whether the disk (D) attached to the disk drive 4 is a double track disk or a single track disk.

FIG. 2 and the third factor are flowcharts showing the operation flow of data input/output processing in the above embodiment, and FIG. 2 shows the output (write) processing file a-1 to logical track number n.
FIG. 3 shows the doujinshi (reading #) processing flow. In addition, here, the double track format is 2D D (251des D
double densityDouble track
s) format and the single track format are called the 2D format.

Here, the operation of one embodiment will be explained with reference to the above-mentioned FIGS. 1 to 3. In addition, when a double track disk is attached to disk drive 4, the operation will be the same as before.
Since the human output is performed on a track-by-track basis, the explanation thereof will be omitted here. The operation when a single track disk is installed will be explained.

1) When the operation control unit 3 at the time of data output (including format processing) receives an output request to track number n,
Head (HD) i track number 2 n+ in seek circuit 1
Request to position to 0. When this seek operation is completed, the control section 3 issues a request to the input/output circuit 2 to write data to that track.

When the writing of the above data is completed, the control a device 3
Position the head (HD) at track number 2n+1,
Write the same data on that track. In other words, the same data is written to both trunks of tracks 2°10 and 2°+1. Then either track (2n+o/2n
+1) If data writing fails, it returns as an error. This data output processing flow is shown in FIG.

2) When the data input operation control section 3 receives a manual request for track number n, it requests the seek circuit 1 to position the head (HD) at trunk number 2n10. When this seek operation is completed, the control section 3 issues a request to the input/output circuit 2 to read the data of that track.

If these operations are completed normally, the process returns as is. Father, if you fail, go to Nodo (HD) with track number 211
+1 and read the data of that track. If this reading also fails, it returns as an error. This data input processing screen is shown in FIG.

In this way, in a double track disk drive, if the attached disk is a single trunk disk,
By adopting a configuration that controls data input/output on a track-by-track basis, it is possible to read data written on a double-track disk drive using a single-track disk drive, and when reading data from a single-track disk using a double-track disk drive. data can be exchanged with high reliability.

〔Effect of the invention〕

As described in detail above, according to the disk control device of the present invention, in a double track disk drive, it is possible to determine whether the disk being used is a double track format or a single track format, and when the disk is in a double track format, The system controls data writing/reading in units of one track, and in single track format, controls data writing/reading in units of two tracks. It is possible to reduce the frequency of errors occurring when data is exchanged using a single-track disk between the two.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG.
3 are flowcharts showing the processing flow of the above embodiment, and FIG. 4 is a diagram showing a comparison of the track configurations of the single track format and the double track format. 1... Seek circuit, 2... Input/output circuit, 3... Control section, 4... Disk drive (for double track), H
D...to, throat, D...disc. Applicant's agent Patent attorney Shikihiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] In a double track disk drive, it is determined whether the disk used is a double track format or a single track format, and if it is a double track format, data writing/reading is controlled on a track-by-track basis, and when the disc is in a single track format, In this case, the disk control device has means for controlling data writing/reading in units of two tracks.