JPS5958570A - Disk format control system - Google Patents

Abstract

PURPOSE:To handle plural formats and to obtain interchangeability among disk packs by providing a data detecting circuit and a check bit generating circuit for every format and performing selection control on the basis of the output of a decoder. CONSTITUTION:The output of a format type code generating circuit 21 is transferred to a disk driver 40 through a data bus 32 during format writing operation at the timing of a format type code timing circuit 22. A flip-flop FF225 is set by the output of the decoder 23 and a check bit generating circuit 30 for a format type FT1 operates. The output of the FF225 is supplied to the output- side gate 39 of a data error detecting circuit 29 during data reading/writing operation and the detecting circuit 29 also operates. When the format type is FT0, a flip-flop FF124 is set and the circuit corresponding to the FT0 operates.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disk control method used in a magnetic disk device using replaceable disk punctures.

[Technical background of the invention and its problems]

Conventionally, when changing to a control device that uses a replaceable disk pack, it has been impossible to replace the disk pack used in the open control device with a disconnect control device because the format of the disk pack is different.

Furthermore, it required a great deal of effort to transfer the data in the disk pack to a new format disk pack. For this reason, conventionally, it has been difficult to make the disk packs compatible between the new and old winter control devices.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and provides a disk pack control that enables disk pack compatibility between new and same control devices without requiring any format conversion of disk packs. The purpose is to provide a method.

[Summary of the invention]

The present invention adopts a formatting method that has a code indicating the format type in the address part, and has hardware in the control device that can handle the old and new cylindrical formats. This allows for compatibility between the two.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows three formats on the disk pack, format types FTo, FT1, FB.
It is assumed that a more advanced error correction polynomial is adopted in the order of . In the figure, TO-T2 is a format type code, AD is an address, OB, to CB are check pits, DT is data, and G is a gap. Format type code T. -T2 corresponds to the combination of the address AD section and the error correction polynomial used for data errors.

CB7 to CB6 have different bit lengths depending on their respective polynomials.

FIG. 2 shows the correspondence between disk punctures DPA, DPB+DPa of the same type formatted into three types, and three types of control devices 10, 10B and 10C. Control equipment Rzok, zoB.

11, 12, and 13 in 10C indicate control circuits (hereinafter referred to as CH-CTL) configured for each formant unit, and 11 is a format.

12 is format type F
13 corresponds to the format type FT. Therefore, the control device 10 has a format type FT.
Only the disk pack DPA of o can be used, and the control device 10C has three format types: FTo+FT.
1 + F T2 each disk pack DPA ID
Indicates that PE and DPa are available.

FIG. 3 is a block diagram showing the internal configuration of the control device 10B shown in FIG. 2 above. In the figure, reference numeral 21 denotes a formant type code generation circuit, and here the format type is designated by a manual operation switch (DIP switch). Reference numeral 22 denotes a format type code timing circuit that determines the read/write timing of the format type code.

A decoder 23 receives the format type code and determines the format type.

24, 25, and 26 are flip-flops (FF'+ +FFt 1FFs) indicating the formant being processed, each of format type FTo r FT1+F.
It is provided corresponding to T2. 27 is a format type FT provided in CH-CTLll.

28 is the same check pit generation circuit, 29 is the data error detection circuit corresponding to CH-C! A data error detection circuit corresponding to the format type FT is provided in the TL 22, and 30 is a check pit generation circuit thereof. 3
Z is a flip 70 that displays data errors and format type errors. Also, 32.33 is a data bus, 34.35. ...39 is a gate, 4θ is a disk drive into which the disk packs DPA, DPB, and DPo are loaded, and 41 is a central processing unit (hereinafter referred to as CPU).
It is. Control device Z17A shown in FIG.

10C has almost the same configuration, but in the case of IOA, CH
-CTL 12 does not exist, and in the case of 10C, in addition to CH-CTL I Z and 12 in FIG. 3 above, CH-
CTL 13 is added.

Here, the operation of one example of leprosy will be explained with reference to the drawings. Here, the operation will be explained for the format type FT.

(1) Format write At the time of format write, the format type code specified by the format type command sent by the CPU 4I, or the format type code T set by the format type code generation circuit 21.
1 is transferred to the disk drive 4o via the data bus 32 according to the timing determined by the format type code timing circuit 22, and folded into the mounted disk pack with a predetermined format. At the same time, the formant type code T is sent to the decoder 23, and its decoded output D1 is the format type F.
Seven lip-flops 25 for T1 display are set.

While the address portion is being sent onto the data bus 32, check bits are being generated in the check bit generation circuits 28, 30. Upon completion of address transfer, gate 3
The check bit CB of the formant type FT created by the check focus generating circuit 30 is outputted onto the data bus 32 via the check focus generating circuit 30 and written into the disk pack provided in the disk drive 4°.

(2) Data read When data is seeded, the control unit RxoB finds the header part on the pack and reads it onto the data bus 33, and then uses the format type code timing circuit 22 to transfer the header part to the data bus 33.
The formant type code T on the data bus 33 is read into the decoder 23 through the decoder 23, decoded, and a 7 lip 70 tag 25 is set as the decode output D1. Part of the header data on the data bus 33 is also supplied to the data error detection circuits 27 and 29 at the same time. At this time, since the flip-flop 25 is set, the gate 39 is controlled to open, and as a result of checking a part of the header,
The contents of the data error detection circuit 29 are selected. If an error occurs, error correction is performed. If there is no error or if the collection is completed, the control device 10B continues reading the data section. Also for the data section read word, the gate 39 uses the result of the data error detection circuit 29 to perform error checking.

(3) Data write When writing data, a part of the header is read out in the same way as when reading data described above. Next, writing of the data section is executed. At the same time, check bit generation circuits 28 and 30 generate checker bits in the data section. After data writing is completed, the check bit generated by the check bit generation circuit 30 is transferred to the data bus 32 by the gate 35.
is output above.

The above has described the operation in the case of the format type FT, but in the case of the format type FTO, the operation of the functional units 25°29.30, 35.39 in the control device 10B is 24.27°2g, 34,311 The operation is the same as that of the format type FT1 described above, except that the operation of each functional unit is different. Also, format type FT.

In this case, the control device JOB cannot handle this format type, so the control unit 70 and the knob 26I31 are set together to notify the CPU 4Z of an error.

In addition to the configuration described above, if the old format is adopted, the disk pack can be shared between the new and the same control devices. Furthermore, if there is a disk pack written by the old control device, it is possible to convert it to a new format and save data using only the disconnection control device. Also, even if a new collection code is developed, compatibility can be maintained in the same way. Furthermore, since the format type is written on the disk pack and the control device automatically changes the format method, the user can handle the disk pack for each edition without having to think about the format type.

〔Effect of the invention〕

As detailed above, according to the disk format control method of the present invention, a formatting method having a code indicating the format type in the address field is adopted, and the control device has hardware that can handle both old and new formats. In particular, disk pack compatibility can be achieved between the new and the same control devices.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Figure 1 is a diagram showing three types of formats on a disk pack, and Figure 2 is a diagram showing three types of disk packs with different format types and the format types that can be handled. FIG. 3 is a block diagram showing an example of use with three types of control devices having different numbers. FIG. 3 is a block diagram showing a specific configuration of one embodiment. 10, 10B, 10C...control device, 11°12.
13... Control circuit (CH-CTL), 2 z... Format type code generation circuit, 22... Format type code timing circuit, 23... Decoder 1, 24.25, 26.31... slip flop,
27.29...Data error detection circuit, 28.30.
...Check pit generation circuit, 32.33...Data bus, 34e35+...39...Gate, 40...
・Disk drive, 41...-Central processing unit (CPU
), DPA, DPE, DPO・=disk pack, 'r
o l'r, I'r,...7 automatic type code. Applicant's agent Patent attorney Takehiko Suzue Figure 1 @ Figure 2

Claims (1)

[Claims] In a magnetic disk drive using a replaceable disk pack, means for generating a format type code specific to a disk format according to a data check format, means for storing this format type code in a specific area of a header part, and the format type code a decoder for decoding the data, a plurality of seven flip-flops for format type display selectively set by the decoded output of the decoder, and a plurality of types of check pins optionally activated by the output signals of the flip-flops. A disk format comprising a check pit generating section and an error detecting section, and writing and reading data to and from a disk pack using the check pit generating section and error detecting section selected by the clip flop. control method.