JPH02146149A - Disk medium identifying system - Google Patents

Abstract

PURPOSE:To prevent the destruction of recorded data by comparing the contents of a variable current output memory means with those of a fixed current output memory means, and identifying the type of a loaded disk medium. CONSTITUTION:A control means 7 successively increases a write current value applied to a head 1 at prescribed magnitude outside the using area of a loaded disk device 10, writes the data, then, reads the data, amplifies them by an amplifying circuit 2, detects a peak value by a peak value detecting circuit 3, converts it into a digital value by an A/D converting circuit 4, and stores a write current value into a variable current output memory means 5 according to timing increased at prescribed magnitude. When the data reading is completed, the write current value and a head output voltage value stored by a fixed current output memory means 5 are respectively compared with the write current value and the head output voltage value stored into the memory means 5, when comparison results are consistent, the disk medium 10 is recognized to be the same type, and when they are in discordance, and error is reported to a host device 11.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a disk medium identification method that makes it possible to identify the type of disk medium in a disk device that writes/reads data to disk media with different storage capacities, and to prevent the destruction of recorded data. Variable current output memory that stores the output value of the head when reading data in correspondence with the current value when writing, in a disk device that writes to/reads from multiple disk media with different storage capacities. fixed current output storage means for storing in advance, for each of a plurality of types of media, a prescribed write current value for the medium and an output value of the head when data written with the prescribed current value is read; The contents stored in the variable current output storage means and the fixed current output storage means are compared, and among the contents stored in the variable current output storage means, the contents stored in the fixed current output storage means match within an error range. A selective control means is provided, and when the medium is loaded, the current value supplied to the head outside the area of use of the medium is sequentially increased to write and read data, and the output value corresponds to the written current value. After storing it in the variable current output storage means, the control means compares the contents of the variable current output storage means with the contents of the fixed current storage means, and based on the result selected by the control means, The configuration is such that the type of disk medium is identified.

[Industrial application field]

The present invention relates to a disk device that writes/reads data to/from disk media with different storage capacities, and in particular, data written on a disk medium is read from the disk medium in response to a write current supplied to a head. The present invention relates to a disk medium identification method that allows the type of disk medium to be identified based on the output value of a signal when the disk medium is detected.

In recent years, for example, floppy disk devices that use floppy disk media with different storage capacities to write and read data have come into wide use. That is, for example, 3.5-inch floppy disk media include 2DD media and 2HD media, and although they have different storage capacities, data is written/read in the same floppy disk device.

When handling such different types of floppy disk media in the same floppy disk device, it is necessary to prevent errors from occurring in the read data due to data being written to the wrong type.

[Conventional technology]

Conventionally, the type of floppy disk medium is identified on the floppy disk device side, and the type is identified on the host device of the floppy disk device.

In the former case, a floppy disk medium with a medium identification detection hole is detected by a detector on the floppy disk device side to identify it.

In the latter case, the host device of the floppy disk device issues a read command, and if the read data does not result in an error, the host device determines that the expected floppy disk medium is installed in the floppy disk device. If there is an error, the floppy disk device is instructed to switch the medium mode, the write/read circuit, etc. are switched, and then a read command is issued again. If there is no error, the expected floppy disk medium can be identified. I judge that.

That is, when writing data to floppy disk media with different recording capacities, the writing frequency is different, so if the number of rotations of the write/read circuit and the floppy disk medium is different, it is necessary to switch the spindle motor. If these differ from the expected floppy disk medium, the read data will result in an error, so the type of floppy disk medium can be identified.

[Problem to be solved by the invention]

When using an unused floppy disk medium in a computer system that operates by connecting a floppy disk device, for example, when the floppy disk device is connected to a personal computer, the floppy disk must be in a format that is compatible with the personal computer. Media may be formatted.

In addition, a floppy disk medium used in another computer system may be reformatted and used in the own system.

When using an unused floppy disk medium, if the floppy disk medium does not have a medium identification detection hole, or if it has a medium identification detection hole but is identified by the host device, the data may not be stored on the floppy disk medium. Since it has not been written, the host device cannot identify the type of floppy disk medium by sending a read command to read the data as described above, depending on whether an error occurs or not.

In addition, when using a floppy disk medium that has been used in another computer system, the data cannot be read because the format is different, and it is also difficult for the host device to identify the type of floppy disk medium. Can not.

Therefore, the identification of the type of floppy disk medium is manually specified. However, manual specification may cause errors. A floppy disk medium that is incorrectly specified can be used for a while after formatting, but because the recording layer of the floppy disk medium is different, errors will eventually occur in the data read, and the data will not be recorded on the floppy disk medium. There is a problem in that the stored data appears as if it has been destroyed and becomes unusable.

In view of these problems, the present invention makes it possible to identify the type of floppy disk medium when a floppy disk medium is installed in a floppy disk device, thereby making it possible to write data suitable for the type of floppy disk medium. The purpose is to prevent recorded data from being destroyed.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

When the control means 7 is specified the type of floppy disk medium by the host device engineer 1 and receives a medium format command,
A head drive circuit (not shown) is operated to move the head l to a track outside the normally used area of the floppy disk medium 10.

Then, the digital value write data is sent to the D/A conversion circuit 8.

The D/A conversion circuit 8 converts the digital value write data into an analog value and sends it to the write circuit 9. The write circuit 9 sends a write current value corresponding to the analog value sent by the D/A converter circuit 8 to the head 1, and the head 1 writes data to the floppy disk medium 10 in accordance with this write current value.

FIG. 2 is a diagram illustrating write current versus output voltage characteristics of a disk medium.

If we take the write current value on the horizontal axis and the head output voltage value on the vertical axis, the dotted curve ■ shows the data written corresponding to the write current value on the 2HD medium of the 3.5-inch floppy disk medium. The curve ■ shown by the solid line, which shows the head output voltage characteristics when read by head 1, is
The head output voltage characteristics are shown when data written in correspondence with a write current value in a 2DD medium such as a 3.5-inch floppy disk medium is read by the head l.

The control means 7 first sends the data to the D/A conversion circuit 8 so that the write current value becomes the current value shown in FIG. 2 rst, and then sequentially increases the current value by a predetermined magnitude. and send it out. Therefore, the data written by the head 1 on the floppy disk medium 10 is written in correspondence with the write current value which sequentially increases by a predetermined amount.

When the write current value reaches ISF in FIG. 2, the control means 7
Stop sending write data. Then, a head drive circuit (not shown) is operated to control the head 1 to follow the track on which this data has been written.

Data read by the head 1 is amplified by an amplifier circuit 2, and a peak value is detected by a peak detection circuit 3.

This peak value is converted into a digital value by the A/D conversion circuit 4 and sent to the variable current output storage means 5. The control means 7 causes the variable current output storage means 5 to store the digital value sent out by the A/D conversion circuit 4 in accordance with the timing at which the write current is increased by a predetermined amount.

The digital value sent out by the A/D conversion circuit 4 is
Since the output value of the signal sent out by the control means 7 is proportional to the output voltage value of the head, the variable current output storage means 5 stores the curve shown in FIG. It is sampled and stored accordingly.

A write current value I shown in FIG. 2 is stored in the fixed current output storage means 6 in advance. and ■. and the head output voltage value ■□ and VD are stored. This write current value IWH and ■. is the specified write current value for each type of floppy disk medium, and the head output voltage value VH and . This is the output value of the generated signal, that is, the head output voltage value.

When the data reading is completed, the control means 7 compares the write current value stored in the fixed current output storage means 6 with the write current value stored in the variable current output storage means 5 and the head output voltage value ■□. , this write current value is compared with the corresponding head output voltage value.

In this comparison result, the contents stored in the variable current output storage means 5, that is, the write current value and the head output voltage value corresponding to this write current value, match within a predetermined error range for IWH and VM. If there is something to do, control means 7
determines that the installed floppy disk medium is 2HD, and reports an error to the host device 11 if the type of floppy disk medium is different from the type specified by the host device 11.

Further, the control means 7 writes the write current value ■ stored in the fixed current output storage means 6. Then, with respect to the head output voltage value VD, the write current value stored in the variable current output storage means 5 and the head output voltage value corresponding to this write current value are compared.

In this comparison result, if there is one that matches within a predetermined error range for IWD and VD among the write current value stored in the variable current output storage means 5 and the head output voltage value corresponding to this write current value? For example, the control means 7 determines that the installed floppy disk medium is a 2DD, and if the type of floppy disk medium is different from the type specified by the host device 11, it reports an error to the host device 11.

[Effect]

With the above configuration, the control means 7 compares the contents of the variable current output storage means 5 and the fixed current output storage means 6 to determine the type of floppy disk medium specified by the host W11 and the floppy disk device. Since it is possible to recognize whether or not the type of floppy disk medium installed in the floppy disk matches the type of floppy disk medium installed in the floppy disk, formatting the wrong type of floppy disk medium can result in written data being destroyed. , it is possible to prevent errors from occurring in the read data.

〔Example〕

FIG. 3 is a block diagram of a circuit showing one embodiment of the present invention.

When the processor 14 is specified the type of floppy disk medium and receives a medium format command from the host device 11, it operates a head drive circuit (not shown) to move the head 1 to a track outside the normally used area of the floppy disk medium 10. move it. Then, the digital value write data is sent to the D/A conversion circuit 8.

The D/A conversion circuit 8 converts the digital value write data into an analog value and sends it to the write circuit 9. The write circuit 9 sends a write current value corresponding to the analog value sent by the D/A converter circuit 8 to the head 1, and the head 1 writes data to the floppy disk medium 10 in accordance with this write current value.

The processor 14 first sends the data to the D/A conversion circuit 8 so that the write current value becomes the current value shown in FIG. 2 rst, and then sequentially increases the current value by a predetermined amount. and send it. Therefore, the data written by the head 1 on the floppy disk medium 10 is written in correspondence with the write current value which sequentially increases by a predetermined amount.

When the write current value reaches tsr in FIG. 2, the processor 14 stops sending the write data. Then, a head drive circuit (not shown) is controlled to cause the head 1 to follow the track on which this data has been written.

Data read by the head 1 is amplified by an amplifier circuit 2, and a peak value is detected by a peak detection circuit 3.

This peak value is converted into a digital value by the A/D conversion circuit 4 and sent to the variable current output storage section 13. The processor 14 causes the variable current output storage section 13 to store the digital value sent out by the A/D conversion circuit 4 in accordance with the timing at which the write current is increased by a predetermined amount.

The digital value sent out by the A/D conversion circuit 4 is
is proportional to the head output voltage value sent out, the curve shown in FIG. Ru.

The fixed current output storage section 12 stores write current values rho and r shown in FIG. 2 in advance. and head output voltage value ■8 and ■. is memorized. This write current value IWM and ■. is a specified write current value for each type of floppy disk medium, and head output voltage values vH and VD are generated in the head 1 when data written by the specified write current value is read. This is the head output voltage value.

When the data reading is completed, the processor 14 writes the write current value stored in the variable current output storage unit 13 to the write current value I stored in the fixed current output storage unit 12 and the head output voltage value □. This write current value is compared with the corresponding head output voltage value.

In this comparison result, among the write current value stored in the variable current output storage section 13 and the head output voltage value corresponding to this write current value, those that match within a predetermined error range for IWH and (8) If so, the processor 14 determines that the installed floppy disk medium is 2HD, and if the type of floppy disk medium is different from the type specified by the host device 11, it reports an error to the host device 11.

If the type of floppy disk medium specified by the host device 11 is 2HD, the processor 14 positions the head 1 on a predetermined track, sends format data to the D/A conversion circuit 8, and sends the format data to the head via the write circuit 9. 1
and execute formatting.

Further, the processor 14 writes the write current value ■ stored in the fixed current output storage section 12. and the head output voltage value■. For,
A write current value stored in the variable current output storage section 13,
This write current value is compared with the corresponding head output voltage value.

In this comparison result, IWD and ■ among the write current value stored in the variable current output storage section 13 and the head output voltage value corresponding to this write current value.

If there is a match within a predetermined error range, the processor 14 determines that the installed floppy disk medium is 2.
If it is determined that it is a DD and the type of floppy disk medium is different from the type specified by the host device 11, an error is reported to the host device 11.

If the type of floppy disk medium specified by the host device 11 is 2DD, the processor 14 positions the head 1 on a predetermined track, sends format data to the D/A conversion circuit 8, and sends the format data to the head via the write circuit 9. 1
and execute formatting.

If the host device 11 that received the error report specified a 2DD medium, it changes the specification to a 2HD medium, and if it specified a 2HD, it changes the specification to 2DD, and issues the medium format command again to the processor. Send on 14th.

〔Effect of the invention〕

As explained above, the present invention can recognize whether or not the type of floppy disk medium specified by the host device matches the type of floppy disk medium installed in the floppy disk device, so By formatting the floppy disk medium, written data appears to be destroyed, and it is possible to prevent errors from occurring in read data.

10 is a floppy disk medium; 11 is a host device, 12 is a fixed current output storage unit; 13 is a variable current output storage unit; 14 is a processor.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a diagram illustrating write current versus output voltage characteristics of a disk medium, and FIG. 3 is a block diagram of a circuit showing an embodiment of the present invention. In the figure, 1 is a head, 2 is an amplifier circuit, 3 is a peak detection circuit, 4 is an A/D conversion circuit, 5 is a variable current output storage means, 6 is a fixed current output storage means, 7 is a control means, and 8 is a D/D converter. A conversion circuit, 9 is a write circuit, ``i'chair'') 414 11 and toden, and Tamaikiden Z
Takashi Yasei and Yomichizuki Oru Kuchiju 2 Figures - 11111 - 711

Claims (1)

[Claims] Multiple types of disk media (10) each having a different storage capacity
In a disk device that writes and reads data to and from the disk medium, the output value of a signal generated in the head (1) when data is read from the disk medium (10) is determined by the magnitude of the write current value when writing the data. variable current output storage means (5) for storing data in accordance with the storage capacity; and multiple types of disk media (10) each having a different storage capacity.
A specified write current value for the head (1) when data written using the specified write current value is read.
) for each of the plurality of types of disk media.
), and compares the contents stored in the variable current output storage means (5) and the fixed current output storage means (6), and compares the contents stored in the variable current output storage means (5) and the contents of the write current value and output value stored in the variable current output storage means (5). in,
control means (7) for selecting a write current value and output value stored in the fixed current output storage means (6) that match within a predetermined error range; When installed, the disk medium (10)
After sequentially increasing the write current value supplied to the head (1) by a predetermined value to write data outside the used area of the head (1), the data is read out, and the output value at that time is determined as the output value at the time of writing. After storing the current value in the variable current output storage means (5), the control means (7) stores the contents of the variable current output storage means (5) and the fixed current output storage means (6). A disk medium identification method characterized in that the type of the disk medium (10) loaded in the disk device is identified based on the result selected by the control means (7) by comparing the stored contents.