JPS6273460A - Disc controller - Google Patents

Abstract

PURPOSE:To connect the titled device to various disc devices without correction of a program by reading disc characteristic information and disc parameter information of a specific region and using the information to set the disc controller. CONSTITUTION:A disc device 1 is connected to a disc controller 2-1 in the disc controller 2, which consists of a parameter controller 2-2 and the disc controller 2-1, the disc controller 2-1 is operated by a command of a data read signal from a host system 3 based on the disc parameter information stored in the parameter controller 2-2 to access the disc device 1. A predetermined value is set initially to the parameter controller 2-2 as disc parameter information at, e.g., power application. Thus, the disc information stored in the specific region of the disc is read before the disc device is driven and the disc drive means is set according to the read parameter information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disk device, and particularly to a disk control device that accesses disks of various writing formats.

[Prior Art] An auxiliary storage device is generally connected to an electronic computer, a microcomputer, or the like. The auxiliary storage device is a device that stores programs and data of a capacity that cannot be stored in the computer main body, and stores the aforementioned programs and data even when the power is turned off. After the computer is turned on, the necessary programs are loaded.

executed. For example, when the computer is powered on, the computer executes the initial program loader (stored in the computer's ROM), reads the operating system (OS) execution program from the disk drive, and loads it into memory. The system is configured to start up the system. After the system has started up, the disk device storing the O3 mentioned above, as well as the Ike disk device, is controlled by the operator's operations and programs based on the disk device characteristic information and control information registered in advance in the O8. driven by the execution of The disk device operates according to the characteristic information and control information described above.

Conventionally, as mentioned above, the initial program loader and O
Since characteristic information of the disk device and the like are set in advance as fixed in 8, for example, information written in other formats cannot be read out as is. For example, in a floppy disk device, the state of the diskette is determined when the diskette is formatted.

The O8 cannot read programs, data, etc. stored on a diskette whose format is different from the format of the information stored in advance in the OS.

Furthermore, the same problem occurs not only when a floppy disk device is connected but also when an unspecified disk device is connected. For example, in a disk device in which multiple hard disks rotate on the same axis and can be accessed simultaneously by multiple heads, the number of data heads, the number of cylinders in one volume, the number of tracks in one cylinder, and the number of sectors in one trunk depend on the model. It has many parameters such as the number of bytes in one sector, and the information differs depending on the device. For this reason, as before.

It was not possible to read or write to disk devices with different characteristics using the same O8 or the like.

[Purpose of the invention]

In view of the above-mentioned conventional drawbacks, the first object of the present invention is to provide a disk control device that can connect various disk devices without modifying programs such as the initial program loader and O3 of the computer system. A second object of the present invention is to provide a disk control device that is capable of reading data written in different formats.

[Summary of the Invention] In order to achieve the above object, the present invention provides a disc (1) having disc information for driving a disc stored in a specific format in a specific area, and disc information for reading the disc information. reading means (2, 3), and a disk drive fi (2) that drives the disk according to the disk information read by the disk information reading means.
, 3).

The disc information setting means (3) sets the disc information in the disc driving means according to the disc information of the currently installed disc read by the disc information reading means before driving the disc. do. And its action is as follows.

Before driving the disk device, the disk information reading means reads out disk information stored in a specific area of the disk in a specific format. Then, the setting means sets the disk drive means according to the read parameter information.

〔Example〕

The present invention will be described in detail below using two drawings.

FIG. 1 is a circuit configuration diagram of a ninth embodiment of the present invention.

The disk device 1 is connected to a disk controller 2-1 in a disk control device 2. The disk control device 2 includes a parameter control device 2-2 and a disk controller 2-
Based on the disk parameter information G stored in the parameter control device 2-2, the disk controller 2-1 operates in accordance with instructions from the data read signal and data write signal from the host system 3, and the disk controller 2-1 Access 1. The parameter control device 2-2 is configured such that, for example, when the power is turned on, a predetermined value is initialized as disk parameter information.

The host system 3 includes CPU3-1. Main storage device 3-2.
Input/output control device 3-3. It consists of a control information register 3-4, and a CPU 3-1. Control information register 3-4. An input/output control device 3-3 is connected.

The CPU 3-1 executes, for example, a program loaded into the main storage device 3-2, performs control such as outputting data to another device (not shown), and printing data to a printer or the like. When the CPU 3-1 accesses the disk drive 1 to read and write data etc. in the above-mentioned program, the CPU 3-1 reads the disk characteristic information stored in the control information register 3-4 and uses the disk characteristic information. Correspondingly, the disk device 1 is accessed via the input/output control device 3-3 and the disk control device 2.

Although not shown, the host system 3 has an initial program loader in the main storage device 3-2.

At startup, programs such as O8 are loaded onto disk drive 1.
Read and execute. Before loading and executing a program such as O8, the program loader loads disk drive 1.
Reads the disk characteristic information and disk parameter information that are pre-provided in a specific area (O cylinder, 0 track).

Control is performed to set the control information register 3-4 and the parameter control bag 2-2 of the disk control device 2.

FIG. 2 is an information area format diagram showing the contents of disk characteristic information and disk parameter information stored in advance in the O cylinder and the O trunk. Disk characteristic information is the number of cylinders per volume CYL/
VOL, number of tracks per cylinder TR/CYL,
1) It consists of data representing the number of sectors per rank SEC/TR, the number of bytes per sector BYTE/SEC, and the number of blocks available to the user TOTAL BLOCK, and is stored in the O cylinder and 0 trunk area DC■. Then, the step pulse value specific to the disk device, the presence or absence of error checking and correcting FCC, the number of data heads, the number of cylinders, the write power supply reduction cylinder number, and the write phase correction cylinder number are Bo”
It is stored in B+1. Note that 82 to B4 are not used and are reserved areas.

Disk characteristic information and disk parameter information are written in the O cylinder and 0 track of the disk device 1 in a predetermined format, and the disk parameters are set in the parameter control device 2-2 when the power is turned on. The disk characteristic information of the disk device set in the information and program loader is set so that the information written in the aforementioned predetermined format of the O track and 0 cylinder of the disk device 1 can be read.

FIG. 3 is an operational flowchart of an embodiment of the present invention.

Figures 4.5.6 are state diagrams at the time of turning on the power, at the time of setting disk characteristic information, and at the time of setting disk parameters. Note that each device's access is represented by a thick line.

At START, for example, at power-up, disk characteristic information and disk parameter information are read from the system error, ie, O cylinder and 0 track, in the disk device 1 (Sl). When the power is turned on as shown in Figure 4.

The initial program loader stored in the ROM 3-2-1 in the main storage device 3-2 is executed by the CPU 3-1, and the input/output control device 3-3 accesses it based on the disk characteristic information at the time of initialization that the initial program loader has. be done. and parameter control device 2
The initial disk parameter information stored in the controller 2-2 is read out by the controller 2-1, and the disk is driven by a control signal applied via the input/output control device 3-3.

As mentioned above, predetermined values are set in the initial program loader and the parameter control device 2-2 of the disk control device 2 so that the O cylinder and the 0 track can be read.

Disk characteristic information and disk parameter information written in this area, ie, cylinder 0 and track 0, can be read out. Note that the step pulse value of the disk parameter information is a value representing the pulse width required when moving the head, and is unique to the disk device.

Therefore, the step pulse value is
If the value is different from the value set to 2, the disk area cannot be read. However, since the disk device 1 is designed so that the head is set to the 0 cylinder position at the initial time, such as when the power is turned on, only the O cylinder can be accessed.

Then, as shown in FIG. 5, the characteristic information is stored in the disk control information area (control information register 3-4) in C)S (S2). In FIG.

The disk device 1 is represented by a structural diagram. Multiple sheets (4
disks) 1-1 to 1-4 rotate on the same axis 1-14, heads 1-5 to 1-12 are provided on the front and back of each disk 1-1 to 1-4, and the movement of the heads is Moving material 1-1 on which those navels 1-5 to 1-12 are supported
It is done by 3. The 0 trunk and O cylinder are provided at the outermost periphery of the disk 1-1, and the disk characteristic information and disk parameter information written in this trunk are read out by the head 1-5. Furthermore, as shown in FIG. 6, it is set in the parameter control device 2-2 in the disk control device 2 via the disk unit roller 2-1 (S3), and this setting process is completed. In addition,
Parameter control device 2-2- for disk parameter information
The storage process is performed by reading from the 0 cylinder and 0 track of the disk device 1 and storing it in the RAM 3-2 of the main storage device 3-2.
-1, and is read out from the RAM 3-2-1 and stored. The disk parameter information is stored in the parameter control device 2-2 by the above-mentioned operation,
Furthermore, disc characteristic information is stored in the control information register 3-4. The initial program loader accesses the disk device 1 via the disk control value f2 based on the disk characteristic information stored in the control information register 3-4, and loads the OS program in the O8 storage area of the disk device 1, for example, to the main memory 3. -2. At this time, since the disk parameter information stored in the 0 cylinder and 0 track is stored in the parameter control device 2-2, reading of the O8 storage area of the disk device 1 corresponds to the characteristics of the disk device 1. accessed.

In the above operation, it is assumed that the OS program is stored in the OS storage area in a format specific to the disk device 1, but it is assumed that the OS program is stored in another trunk of the O cylinder, for example, and the format of the other tracks is similar to the O track described above. Sometimes, there is no need to read by the information after reading the disk characteristic information and disk parameter information.

It is also possible to directly read out the information set at the time of initialization.

〔Effect of the invention〕

As described above, the present invention reads the disk characteristic information and disk parameter information of a specific area written in a preset format at the time of initialization, sets the disk control device based on the information, and also controls the disk of the host system. Since the contents of the information register are also set, according to the present invention, it is possible to obtain a disk control device that can connect various disk devices without modifying programs such as the initial program loader and O8.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention. FIG. 2 is an information area format diagram of the disk device. FIG. 3 is a flowchart of an embodiment of the present invention. FIG. 4 is a state diagram when the power is turned on. FIG. 5 is a state diagram when setting characteristic information. FIG. 6 is a state diagram when setting disk parameters. 1...Disk device. 2...Disk control device. 2-1...Disk controller. 2-2...Parameter control device. 3...Host system. 3-1...cpu. 3-2... Main storage device. 3-3... Input/output control device. 3-4...Control information register.

Claims (1)

[Scope of Claims] 1) A disk (1) having disk information for driving a disk stored in a specific format in a specific area, and disk information reading means (2, 3) for reading the disk information. , a disk driving means (2, 3) for driving the disk according to the disk information read by the disk information reading means, and a currently installed information read by the disk information reading means before driving the disk. A disk control device comprising a disk information setting means (3) for setting the disk information in the disk drive means according to the disk information of the disk. 2) The disk control device according to claim 1, wherein the specific area of the disk is 0 track and 0 sector of the disk. 3) The disk control device according to claim 1, wherein the specific format for storing disk information on the disk is a common format for various types of disks. 4) The disk control device according to claim 1, wherein the disk information setting means is a computer system to which a disk device is connected. 5) The computer system includes at least one of an initial program loader program and an operating system program, and the settings are made by at least one of the initial program loader program and the operating system program. 5. The disk control device according to item 4. 6) The disk control device according to claim 1, wherein the disk drive means comprises a computer system and a disk control section that controls the drive of the disk by the computer system. 7) The disk information consists of disk characteristic information and disk parameter information, the disk characteristic information is stored in a control information register provided in the computer system, and the disk parameter information is stored in a control information register provided in the computer system. 7. A disk control device according to claim 6, which is stored in a parameter control device. 8) The disk according to claim 6, wherein the disk information read from the disk is stored in the memory of the computer system and then stored in at least one of the control information register and the parameter control device. Control device.