JPS61229270A - Memory device - Google Patents

Abstract

PURPOSE:To reduce a device error occurring ratio by comparing the prescribed value with the counted value of the number of continuous times access to the same area of a memory medium and operating an automatic attaching and detaching mechanism when they are equal. CONSTITUTION:While read/write actions are executed, contents of a re-try counter C counting times continuously accessing the same area of the memory medium 8 are compared with those N of a time setting means 6. When they are equal, a spindle motor 10 is turned off, and the memory medium 8 stops its action. Then a solenoid 13 is turned off to pull out a chucking mechanism 11 by a spring 12, and the memory medium 8 is made free. Next a roller 14 is rotated reversely, and a sensor 16 detects the on state, which means that the memory medium 8 is discharged to the prescribed position. Then the roller 14 is rotated regularly, and the sensor 17 is turned off. At this time, since the memory medium 8 is located at a normal inserting position, the roller 14 is stopped to turn on the solenoid 13. Then chucking is executed again, and the spindle motor 10 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a storage device, and more particularly to a storage device equipped with a storage media attachment/detachment mechanism.

[Summary of the Disclosure J This specification and drawings are based on 1. In a storage device equipped with a storage medium attachment/detachment mechanism, such as a magnetic disk storage device, an automatic storage medium attachment/detachment mechanism and the number of consecutive accesses to the same area of the storage medium are provided. a counting means for counting, and a comparison means for comparing the counted value of the counting means with a predetermined value;
The comparison means includes a control means for operating an automatic storage medium attachment/detachment mechanism when a comparison match is detected, and when a predetermined number of consecutive access errors are detected, automatic resetting of the storage medium is performed. A note on how to recover from these types of errors! The technology of the device is disclosed.

[Prior Art] Conventionally, a floppy disk device is a typical example of this type of storage device. This device can chuck a flexible diskette, which is a storage medium, at an appropriate position without damaging it, and can read and write information freely. Generally, the error rate of devices is about 10% as a storage medium, but in order to improve this error rate, recapture and retry are used to cover the error rate, and the actual error rate is reduced to 1.
It has been raised to 0-7. However, especially with new diskettes, the hole in the center of the magnetic material may have a crack, the large surface may have a rough finish, or the disk jacket may not be used to the magnetic surface. Errors are likely to occur because information is not read or written on the same track no matter how many times you recalibrate or retry.

Moreover, in many cases, this type of error can be recovered by re-inserting the diskette, but such an operation is time-consuming and often causes the diskette to be determined to be defective before the operation.

[Problems to be Solved by the Invention] The present invention aims to automatically recover from errors such as those described above, and to substantially reduce the rate of device error occurrence.

Means for Solving Problem E] As a means for solving this problem, for example, the flexible magnetic disk device of the embodiment shown in FIG. a counter C that counts the number of consecutive accesses to the area;
Comparison means 3 compares the counted value of the counter C with a predetermined value N held by the try number setting means 6 (the process shown in FIG. 2 executed by the CPU 3), and when the comparison means 3 detects a comparison match, it A control means 3 (control shown in FIG. 3 executed by the CPU 3) for operating the automatic attachment/detachment mechanism section 1 of the media 8 is provided.

[Operation] In the configuration shown in FIG. 1, when a certain area on the storage medium 8 is being read/written, when the contents of the counter C that counts the number of consecutive accesses reaches a predetermined value N, the automatic attachment/detachment mechanism is activated. The unit 1 is energized, once unchucking the storage medium 8, ejecting the storage medium 8 to a predetermined position, and then properly positioning and chucking it again to make it reusable.

E. Embodiment Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a flexible magnetic disk device according to an embodiment. In FIG. 0, numeral 1 represents a flexible disk automatic attachment/detachment mechanism, and numeral 2 represents its controller. A plurality of automatic attachment/detachment mechanisms 1 can be connected to each controller 2, and the functions of the controller 2 can also be directly performed by a host computer (not shown).

Further, in the automatic attachment/detachment mechanism section 1, 8 is a magnetic storage medium (flexible disk) with attachment/detachment marks, 9 is a part of the pedestal of the mechanism section 1, 10 is a spindle motor for rotating the storage medium, and 11 is a chuck of the storage medium 8. It is a king mechanism 1 and is normally held open by a spring 12 supported by a part of the pedestal so that a storage medium can be slid into it.

Reference numeral 13 designates an electromagnetic solenoid, which, when energized, pulls down the chucking mechanism 11 and fixes the storage medium 8 to the spindle portion. Reference numeral 14 denotes a roller for feeding the storage medium 8, which rotates in forward/reverse directions by the rotation of a motor (not shown).For example, when the roller 14 rotates in the direction of the arrow in the figure (forward direction), the storage medium 8 is moved to the pedestal 9. Move the top to the right (insert) direction. Further, when the roller 14 rotates in the opposite direction, the storage medium 8 moves on the pedestal 9 in the left (discharge) direction. Numerals 15 to 17 are photosensors that detect the presence or absence of the storage medium 8, and detect the state of "storage medium present" when the storage medium 8 blocks each of them. Reference numeral 18 is a drive circuit for a motor, solenoid, etc., and reference numeral 19 is a sense circuit for outputting photosensors 15 to 17. Although not shown, it also includes a head mechanism for reading and writing data, a seek mechanism that moves the head mechanism horizontally on the storage medium, an index pulse generation circuit that detects rotation of the storage medium, and an amplifier for reading and writing data.

Furthermore, in the controller 2, 3 is a central processing unit (CPU) that handles the main control of the controller 2.
), 4 is a ROM containing the control program shown in FIGS. 2 and 3 executed by the CPU 3, and 5 temporarily stores reading data and information necessary for controlling the automatic attachment/detachment mechanism section 1 (access count counter C). 6 is a number setting means for setting the number of consecutive accesses to the same area;
7 is an interface for connecting to, for example, a host computer (not shown).

Here, the automatic attachment/detachment mechanism 1 and the controller 2 exchange information via lines 100 and 101. Signals from the controller 2 include various control-related signals, such as on/off of the spindle motor 1O, head seek, etc. There are signals such as operation, forward/reverse rotation control of the storage media insertion/ejection roller 14, read/write instructions, and write data. Signals from the automatic attachment/detachment mechanism 1 include, for example, the setting status of the storage media 8, There are index pulses, write protection, etc., and read data.

The operation of an actual example will be explained below.

FIG. 2 is a flowchart showing the control procedure of the controller 2. First, when the power is turned on in step S1, a counter C is cleared in step S2, and it is determined in step S3 whether there is a read/write (R/W) command.

If there is no R/W command, the process advances to step S4 and it is determined whether there is a seek command. If there is no seek command, the process returns to step S3 to wait for a command, and if it is determined in step S4 that it is a seek command, seek control is executed in step S9. After executing the seek, return to step S2 and count the counter C.
Clear. This is because the presence of a seek command means a track change, and it can be determined that the previous read/write operation was normally completed without an error.

If it is determined in step S3 that it is an R/W command, the process advances to step S5 to execute a read/write operation. Step S
In step S6, the content of the retry counter C is compared with the content N of the number setting means 6, and if the comparison does not match, the process proceeds to step S7 and the content of the counter C is incremented by one. In this case, it does not matter whether or not an error occurred in the previous read/write operation, but since it is normal for read/write instructions to continue without a seek instruction other than an error occurring, the number of accesses cannot be set unconditionally. Count. In addition, if it is determined in step S6 that there is a comparison match, the process advances to step S8 to perform re-chucking control, which will be described later.1 Since continuous access has been performed on the same track more than a predetermined number of times, recovery cannot be performed using normal error recovery methods. This is because we judged that.

FIG. 3 is a flowchart showing the re-chucking control procedure. In step 311, the spindle motor 10 is turned off. In step 512, the index pulse is monitored to wait for the storage medium 8 to stop. The stoppage of the storage medium 8 can be determined by not generating an index pulse for a predetermined period of time. In step 313, solenoid 13
Turn off. As a result, the chucking mechanism 11 is pulled up by the spring 12, and the storage medium 8 becomes free. In step S14, the roller 14 is rotated in the opposite direction.

In step 315, wait until the output of the sensor 16 senses ON (no storage medium). When the sensor 16 detects ON, it indicates that the storage medium 8 has been ejected to a predetermined position. Next, the process advances to step 316 and the roller 14 rotate in the forward direction. In step 317, the process waits until the sensor 17 is turned off. When the sensor 17 is turned off, the storage medium 8 is at the normal insertion position. In step S18, the roller 14 is stopped, and in step 519, the solenoid 13 is turned on to perform chucking again. In step 320, the spindle motor IO is turned ON, and in step 521, the process waits until the storage medium becomes ready for access (predetermined rotational speed).

Incidentally, in the above-mentioned embodiment, when it is determined that an error has occurred, a method is explained in which the error is recovered by re-chucking the system, but depending on the case, a method may also be adopted in which the storage medium 8 is simply ejected automatically and the subsequent steps are left to the user. It can be taken. In this case, both types may be switched by switching an internal switch or the like.

Further, although this embodiment has been described with respect to a magnetic disk device, other devices such as an optical disk device may also be used.

E. Effects of the Invention As described above, according to the present invention, even if an error that cannot be recovered by the normal gluing try function occurs, the chucking operation is performed again, so that errors related to poor chucking or the like can be automatically recovered. Therefore, the actual error rate as a storage device is significantly improved.

[Brief explanation of drawings]

! FIG. 1 is a block diagram showing the flexible magnetic disk device of the embodiment, and FIG. 2 is a flowchart showing the control procedure of the controller 2. FIG. 3 is a flowchart showing the re-chucking control procedure. Here, 1... automatic attachment/detachment mechanism section, 2... controller, 3... central processing unit (CP
U), 4-ROM, 5-RAM, 5-number of times setting means, 7
...Interface, 8...Flexible disk, 9...Pedestal, 10...Spindle motor, ll.
...Chucking mechanism, 12...Spring, 13...Electromagnetic solenoid, 14...Roller, 15-17...Photo sensor, 18...Drive circuit, 19...Sense circuit.

Claims (3)

[Claims] (1) An automatic attachment/detachment mechanism for a storage medium, a counting means for counting the number of consecutive accesses to the same area of the storage medium, a comparison means for comparing a count value of the counting means with a predetermined value, and the comparison means A storage device characterized by comprising a control means for operating an automatic attachment/detachment mechanism for the storage medium upon detecting a comparison match. (2) The storage device according to claim 1, wherein the control means automatically ejects the storage medium when the comparison means detects a comparison match. (3) The control means automatically ejects the storage medium when the comparison means detects a comparison match, and then automatically inserts the storage medium into a reusable state.
Storage device as described in section.