JPS6353759A - Memory device - Google Patents

Abstract

PURPOSE:To permit the read and write of data in a reversely inserted state, by performing the read and write in a state that the rotating direction of a floppy disk is reversed, or the state that the bits of the data are arranged reversely to normal arrangement, when the reverse insertion of the floppy disk is detected at a detecting mechanism. CONSTITUTION:When the floppy disk is inserted reversely, light from a light source P passes through a punched hole H,and is supplied to a photodetector 2, and a detecting signal of high level is supplied to a two sides detection circuit 3, and a read and write R/W control circuit 4, and a shift control signal of high level is supplied to a shift register 9. And in a readout mode, a held data is supplied to the circuit 4 in series through a path (b),and the data in which the bits are arranged reversely, is outputted through a terminal 11. Meanwhile, in a write mode, the data fetched in the circuit 4 from the terminal 11 is inputted to the shift register 9 in series through the path (b), and it is converted to a parallel data, and sent to a shift register 10, then it is written through a head driving circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to data storage technology and data reading and writing technology in a disk storage device. This invention relates to techniques effective for use in read and write methods.

[Prior Art] As personal computers and the like have become more popular, floppy disks, which are easy to handle and are inexpensive, have become widespread. To read and write data using this floppy disk, the floppy disk is set in a disk drive, and while the floppy disk is rotated in a predetermined direction, the direction of the magnetic field is detected by the magnetic head, and the direction of the magnetic field is detected according to the written data. This is done by reversing the magnetic field.

[Problems to be solved by the invention] In conventional floppy disk devices, the direction of rotation of the disk is constant, so if the floppy disk is set upside down (hereinafter referred to as reverse insertion), the data arrangement will be reversed. Therefore, a mechanism is generally provided to disable data reading or writing in this state.

The floppy disk insertion slot of a disk drive may be vertical or horizontal.

Especially in the former case, it is difficult to judge which side of the floppy disk should be oriented left or right, and there is a good chance that the floppy disk will be inserted upside down. There was an inconvenience in that reading or writing could not be performed immediately, and the reader had to set the device in the correct orientation again before reading or writing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floppy disk device that allows reading and writing to be performed immediately even when the floppy disk is inserted upside down into a disk drive device.

The above and other objects and novel features of the present invention will become clear from the description of this specification and the accompanying drawings.

[Means for Solving the Problems] Representative inventions disclosed in this application will be summarized as follows.

That is, a floppy disk is provided with identification means that can identify the front and back sides of the floppy disk, and the disk drive device is provided with a detection mechanism that can detect the front and back sides of the floppy disk set thereon based on the identification means. If the above-mentioned detection mechanism detects that the floppy disk set in the disk drive is upside down (inserted backwards), either rotate the disk in the opposite direction to the disk rotation direction when it is correctly inserted. Alternatively, the bit arrangement of data during reading/writing is reversed in the reading/writing circuit within the device.

[Operation] According to the above-described means, when the detection mechanism detects that the floppy disk is inserted in the opposite direction, the direction of rotation of the floppy disk is reversed or the read/write operation is changed. The bit arrangement of the original data is reversed from the normal one, and reading and writing are performed in that state, so even if the floppy disk is inserted upside down into the disk drive, reading and writing can be performed immediately in that state. The above object of providing such a floppy disk device can be achieved.

[Embodiment] FIG. 1 shows an embodiment in which the present invention is applied to a floppy disk device.

In the figure, a floppy disk designated by reference numeral 1 is provided with a hole H so that the front and back sides of the floppy disk can be identified. Although not particularly limited, the perforation H allows light emitted from the light source P to pass to the opposite side when the floppy disk is inserted upside down as shown. That is, when the floppy disk 1 is inserted upside down, the light emitted from the light source P passes through the perforation H of the floppy disk 1 and is supplied to the light receiving element 2.

When light is supplied through the perforation H, the light receiving element 2 supplies, for example, a high level detection signal to the front/back detection circuit 3. On the other hand, when the floppy disk 1 is correctly set, the perforation H is positioned away from the path of the light emitted from the light source P. In other words,
In this state, the light emitted from the light source P is blocked by the floppy disk 1. Therefore, no light is supplied to the light receiving element 2, and a low level detection signal is supplied to the front/back detection circuit 3. The front/back detection circuit 3 supplies a front/back detection circuit to a read/write control circuit (hereinafter referred to as an R/W control circuit) 4 in accordance with the level of the detection signal outputted and supplied from the light receiving element 2 . Although not particularly limited, if the floppy disk 1 is set in reverse, that is, if a high-level detection signal is supplied from the light receiving element 2, a high-level front/back detection signal is output, and the floppy disk 1 is set correctly. In other words, when a low level detection signal is supplied from the light receiving element 2, a low level front/back detection signal is output.

The R/W control circuit 4 is an R/W (read/write) circuit that sets read mode or write mode.
A control signal is supplied to the head drive circuit 5, and a shift direction control signal is supplied to the shift register 9. Although not particularly limited, when a high level R/W control signal is supplied to the head drive circuit 5, a read mode is set,
When a low level R/W control signal is supplied, a write mode is set.

Further, although not particularly limited, when the front and back detection circuits at a high level are supplied to the R/W control circuit 4 from the front and back detection circuits 3, the R/W control circuit 4
supplies a high level shift control signal to the shift register 9. On the other hand, the low level front/back detection circuit is connected to the R/W
When supplied to the control circuit 4, the R/W control circuit 4 supplies a low level shift direction control signal to the shift register 9.

Shift register 9 is in read mode.

When a high level shift direction control signal is supplied.

The held data is serially supplied to the R/W control circuit 4 via the path (b), and the data with the bit arrangement reversed is output via the input/output terminal 11. Meanwhile, in write mode.

When a high-level shift direction control signal is supplied, the data taken into the R/W control circuit 4 from the input/output terminal 11 is serially input to the shift register 9 via path (b), and this is converted into parallel data. and sent to the shift register 10.

When a low-level shift direction control signal is supplied to the shift register 9, the same read/write data transfer as described above is performed between the shift register 9 and the R/W control circuit 4 via path (b). .

In step 12, consider reading data from the floppy disk 1 when the floppy disk 1 is inserted upside down.

Light emitted from the light source P passes through the perforation H of the floppy disk 1 and is supplied to the light receiving element 2 .

Based on this, the light receiving element 2 supplies a high level detection signal to the front/back detection circuit 3. Based on this, the front/back detection circuit 3 supplies a high level front/back detection signal to the R/W control circuit 4. Based on this, the R/W control circuit 4 supplies a high level shift direction control signal to the shift register 9 and also supplies a high level R/W control signal to the head drive circuit 5. At the same time, the controller 6 supplies a signal to the motor driver 7 to start driving the motor 8. As a result, the floppy disk 1 is driven by the motor 8. In this state, the data in the floppy disk 1 is serially read out and held in the shift register 10, and this held data is sent in parallel to the shift register 9 and sent to the R/W via path (b). The signal is output from the control circuit 4 via the input/output terminal.

On the other hand, when data is written to the floppy disk 1, a low-level R/W control signal is supplied to the head drive circuit 5, and the write data is transferred from the input/output terminal 11 to the shift register 9 via the path (b). Data is input serially.

Then, this data is sent in parallel to the shift register 10, this data is supplied to the head drive circuit 5, and data writing is performed.

By the way, when reading when the floppy disk 1 is set correctly, the light emitted from the light source P is not supplied to the light receiving element 2, the light receiving element 2 outputs a low level detection signal, and the true side output circuit 3 is outputted from the light receiving element 2. is supplied to and,
The front/back detection circuit 3 outputs a low level front/back detection circuit, which is supplied to the R/W control circuit.

As a result, a low level shift direction control signal is output from the R/W control circuit 4 and supplied to the shift register, and the data in the shift register 9 is output from the path (a) via the input/output terminal 11. On the other hand, when the floppy disk is correctly set, writing is performed via path (a) in the same manner as when the floppy disk 1 is inserted upside down.

Furthermore, in the above embodiment, when the motor driver 7 is inserted backwards, reading and writing are performed by reversing the bit arrangement by reversing the transfer direction of the data at the time of reading and writing. This can also be realized by a method in which reading and writing are performed by rotating the motor 8 in the opposite direction to the normal rotation direction and reversing the rotational direction of the floppy disk 1 inserted upside down.

In the first embodiment described above, the floppy disk 1 is provided with a perforation H for identifying the front and back sides, and a light source P and a light receiving element 2 are provided as a detection mechanism.

When the light-receiving element 2 receives light and outputs a high-level detection signal (reversely inserted state), the data in the shift register 9 is output via the path (b). By inputting data through b), even if the floppy disk 1 is inserted upside down and rotated normally to perform reading/writing, the bit arrangement of the data will be the same as during normal reading/writing. As a result, even if the floppy disk 1 is inserted upside down, it is possible to immediately read and write data in that state.

Furthermore, in the second embodiment, when the floppy disk is inserted upside down, the rotation direction of the floppy disk is changed by the motor 8, so that data can be stored as before without changing the bit arrangement during reading and writing. Even if the floppy disk is inserted upside down, data can be read and written immediately without changing the floppy disk.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. Nor.

For example, in the above embodiment, the front and back sides of the floppy disk are detected by light, but the front and back sides may be detected by a mechanical detection mechanism.

In the above explanation, the invention made by the present inventor was mainly applied to a floppy disk device, which is the background field of application. It can be used in optical disk devices that read and write data.

[Effects of the Invention] The effects obtained by typical inventions disclosed in this application are briefly explained below.

That is, even if a floppy disk is accidentally inserted upside down, reading and writing can be performed in that state.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a floppy disk device. 1... Floppy disk, 2... Light receiving element, 3
... Front/back detection circuit, 4... R/W control circuit, 5... R/W circuit, 6... Controller, 7... Motor driver, 8... Motor ,9,
10...Shift register, H...Drilling. 7'7゛＼ Agent Patent Attorney Katsuma Ogawa (,

Claims (1)

[Scope of Claims] 1. A storage device in which bit information is written by a write head by rotating a removable disk-type storage medium having identification means that allows front and back sides to be identified, wherein bit information is written on the storage medium based on the identification means. detection means for detecting front and back sides of the storage medium; and a bit for reversing the bit arrangement of data when reading or writing data from the storage medium at least when the storage medium is undesirably set with respect to the storage device. A storage device comprising a reversing means. 2. The storage device according to claim 1, wherein the storage medium is provided with perforations as identification means. 3. The storage device according to claim 1 or 2, wherein the detection means comprises a light source and a light receiving element. 4. In addition to the bit reversing means, the storage device includes a motor that can control the direction of rotation of the storage medium depending on the set state of the storage medium. , the storage device according to item 2 or 3.