JPH0368016A - Auxiliary storage controller - Google Patents

Abstract

PURPOSE:To execute write to plural mediums of different recording formats by the same method by detecting automatically the recording format of an inserted storage medium, and converting a request for writing data to a format conforming therewith. CONSTITUTION:When it is detected by a state monitor that a floppy disk is inserted into an FD driving device 4, a detecting device 7 outputs an instruction for detecting a size of a physical sector to the FD driving device 4 and checks a recording format, and stores it in a recording format store table 8. When a data read/write request from an application program 2 is generated, a converter 9 fetches the recording format from the recording format store table 8, converts that data by using a converting information table 10 in accordance therewith and executes read and write.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a data processing device such as an electronic computer,
The present invention relates to an auxiliary storage control device.

[Prior Art] Conventionally, an auxiliary storage control device reads and writes data by unconditionally converting a data read/write request from an application program into an operation command for the auxiliary storage drive device.

[Problems to be Solved by the Invention] However, in the prior art, since the recording formats to be read and written are fixed, there is a problem that storage media with a plurality of different recording formats cannot be used simultaneously.

The present invention solves these problems by automatically detecting the recording format when the storage medium to be used is inserted into the auxiliary storage drive, and creating a table prepared for each auxiliary storage drive. When a request for reading or writing data from an application program occurs, each auxiliary storage drive device is operated based on the recording format retrieved from the table, so that data can be stored in multiple storage media with different recording formats. It is an object of the present invention to provide a means for reading and writing data simultaneously and using the same method.

[Means for Solving the Problems] The auxiliary storage control device of the present invention includes: monitoring means for detecting insertion and ejection of a storage medium; detection means for detecting the recording format of the inserted storage medium; The apparatus is characterized by comprising a storage means for storing the recording format detected by the detection means, and a conversion means for converting into an operation command for the auxiliary storage drive device based on the recording format stored in the storage means.

[Examples] Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is a functional block diagram showing the configuration of a system to which a floppy disk control device to which an auxiliary storage control device of the present invention is applied is connected.

1 is a central processing unit that controls the entire system;
2 is an application program that reads and writes data to and from the floppy disk; 3 is a main storage device that stores data read from the floppy disk; and holds data to be written; and 4 is an application program that drives the floppy disk. It is a floppy disk drive equipped with a q mechanism for reading and writing.

Reference numeral 5 denotes a floppy disk control device which is a characteristic part of the present invention, including a status monitoring device 6 for monitoring insertion and ejection of the floppy disk, a detection device 7 for checking the recording format, and a floppy disk control device for storing the detected recording format. A recording format storage table 8 prepared for each disk drive, a conversion device 9 that converts data read/write requests from the application program 2 into operating instructions for the floppy disk drive 4, and information for conversion are stored. It consists of a conversion information table 10.

The detecting device 7 stores the detected recording format in the recording format storage table 8, and the converting device i9 retrieves the conversion information corresponding to the recording format taken out from the recording format storage table 8 from the conversion information table 10, and converts it into a floppy disk. It is configured to convert into operation commands for the drive device 4.

FIG. 2 is an explanatory diagram showing the structure of the tenth conversion information table.

Data read/write requests by the application program 2 are made using logical sector numbers.

A logical sector is a collection of data that is the minimum unit of a floppy disk read/write request.
A collection of 56 bytes of data is defined as one logical sector.

The logical sector number is the number from the beginning of the floppy disk.
This represents the order in which logical sectors are allocated consecutively, excluding unused areas.

The conversion information table is defined by the logical sector number, where 21 is the number of logical sectors (hereinafter abbreviated as GAP) representing the size of the unused area at the beginning of the floppy disk, and 22 is the number of 1 cylinder. Number of logical sectors per unit (hereinafter referred to as N).

23 is the number of logical sectors on one side of the cylinder (hereinafter abbreviated as NOH), and 24 is
Number of logical sectors per physical sector, which is the actual sector on a floppy disk (hereinafter abbreviated as NOP)
It is.

FIG. 3 is a specific example of FIG. 2.

(a) is a conversion information table for a double-sided floppy disk with a physical sector size of 256 bytes (52 physical sectors per cylinder); (b) is a conversion information table for a double-sided floppy disk with a physical sector size of 1024 bytes, This is a conversion information table for a double-sided floppy disk with 16 physical sectors per cylinder.

Next, the operation of the device configured in this way is shown in FIGS. 4 and 5.
This will be explained based on the flowchart shown in the figure.

FIG. 4 is a flowchart showing the operation of the condition monitoring device 6 and the detection device 7, and FIG. 5 is a flowchart showing the operation of the converting device 9.

The status monitoring device 6 monitors whether a floppy disk is inserted into the floppy disk drive device 4 (
42). When the floppy disk is inserted, control is transferred to the detection device 7.

The detection device 7 checked the recording format by executing a command to detect the size of the physical sector on the floppy disk drive device 4 (43), and converted the result into an identifier assigned to each recording format. After that (44), it is stored in the recording format storage table 8 (45). Further, a value indicating that the floppy disk drive device 4 is ready for use is stored in the recording format storage table 8 (46).

The conversion device 9 monitors whether a data read/write request by the application program 2 has occurred (52). When a request is generated, it is checked whether the target floppy disk drive 4 is ready for use by determining the value stored in 46 (53). If the request is not available, the application program 2 is notified that the request has been discarded (60).

If it is in a usable state, the identifier of the recording format stored in step 45 is retrieved from the storage table 8 (54), and the conversion information corresponding to the identifier is retrieved from the conversion information table 10 (55). The logical sector number indicating the read/write part given by the application program 2 is converted to a position on the floppy disk by the conversion information (56). Describing the conversion process in detail, first, GAP is added to the requested logical sector number to obtain the logical sector number on the floppy disk. Next, division is performed at NO8.

The resulting quotient is the cylinder number. The remainder is divided by NOH, the resulting quotient becomes the head number, the resulting remainder is further divided by NoP,
The resulting quotient becomes the physical sector number. By using the cylinder number, head number, and physical sector number obtained through the above conversion, an operation command to the floppy disk drive 4 is generated (57) and executed (58).
Data is read and written.

[Effects of the Invention] As described above, according to the present invention, the recording format of the inserted storage medium is automatically detected, and the result is used to respond to data read/write requests from application programs. By converting the information into an operation command for the auxiliary storage drive device at the time when it occurs, there is an effect that reading and writing can be performed on a plurality of storage media of different recording formats simultaneously and using the same method.

l○・;・Conversion information table that's all

Claims (1)

[Claims] Monitoring means for detecting insertion and ejection of a storage medium; detection means for detecting a recording format of the inserted storage medium; and storing the recording format detected by the detection means. An auxiliary storage control device comprising at least a storage device, and a conversion device that converts into an operation command for an auxiliary storage drive device based on a recording format stored in the storage device.