WO1995020789A1

WO1995020789A1 - Computer hardware disc read/write control device

Info

Publication number: WO1995020789A1
Application number: PCT/CN1995/000010
Authority: WO
Inventors: Tong Shao
Original assignee: Tong Shao
Priority date: 1994-01-28
Filing date: 1995-01-28
Publication date: 1995-08-03
Also published as: AU1574095A

Abstract

A device for controlling a read/write operation of computer hardware disc (HD) comprises: a setting means for setting the first and last magnetic track numbers of a protected area in the hardware disc; a storing means for storing the magnetic track number of HD read/write operations; a legitimacy judging means for judging if a request for HD read/write operations is directed against the protected area; an illegal operation disable means for allowing/disabling the HD read/write operation according to the result judged by the legitimacy judging means. The device can assign an area to protected area by means of simply setting first and last magnetic track number in the HD and ensure the data security of the protected area by hardware.

Description

Computer hard disk read-write control device

The present invention relates to a device for protecting data security in a computer hard disk, and more particularly, to a device for controlling reading and writing of a computer hard disk.

^ View Technology

European Patent Application Jing Jing 9 3 1 0 3 7 4 5. No. 1 discloses a device for protecting data in a computer hard disk from being damaged by viruses or misuse by controlling hard disk read and write. The device includes an interface circuit, A computing chip, a memory and a hard disk read-write control circuit. The memory stores a hard disk read-write force table generated when the computer starts. When the computer is performing read and write operations on the hard disk, an interface circuit is provided to the computing-capable chip for reading and writing, and the latter judges whether the request is legal according to the reading and writing force table stored in the memory. If it is legal, it indicates that the hard disk read-write control circuit allows the computer to read and write, otherwise it indicates that the hard disk read-write control circuit does not allow the computer to read and write.

In the above device, since a read-write force table is used, the control hard disk can read and write to sectors, but this is not necessary in ordinary applications, and the device must have a large capacity memory and calculation. Capability chip makes its cost higher. At the same time, it is troublesome for ordinary users because the reading and writing force table is generated by an application software when the computer is turned on. Disclosure of invention

In view of the above-mentioned shortcomings of the prior art, the main object of the present invention is to provide a computer hard disk read-write control device, which restricts the reading of data therebetween by simply setting the area between any two tracks of the computer hard disk as a protected area Writing, to achieve the purpose of protecting hard disk data, while greatly reducing the cost of the device.

To achieve the above object, the present invention provides a device for controlling read and write of a computer hard disk, which includes:

Device for setting first and last track numbers of protected area of hard disk;

Device for storing track numbers of hard disk read and write operations;

A legitimacy judging device, configured to compare a track number stored in the device that reads, writes, and uses a track number with a first and last track number of a protected area set by the setting device Comparing whether the track number of the read-write operation falls within the protected area to determine whether the read-write operation is legal;

The illegal operation prohibition device is configured to allow the read / write operation to be performed when legal, and prohibited from performing the operation according to the result determined by the judging device.

Compared with the prior art, the present invention has the advantages of achieving satisfactory protection of the hard disk data while reducing the cost of the device and simplifying the operation. Brief description of the drawings

1 is a schematic diagram of a preferred embodiment of a hard disk read-write control device according to the present invention applied to a computer system;

FIG. 2 is a schematic diagram of a hard disk read-write control apparatus according to another embodiment of the present invention applied to a computer system. The best way to implement the invention

Fig. 1 shows a schematic diagram of a preferred embodiment of a hard disk read-write control device according to the present invention applied to a computer system.

In FIG. 1, 1 refers to a hard disk read-write control device according to the present invention, which includes a read-write operation track number register 1 1, a comparison circuit 1 2, a toggle switch 1 3, and a judgment logic module 1 4 , A decoding circuit 15, an OR gate 16 and a lock 17. In Figure 1, 2 refers to the computer bus, 3 refers to the hard disk adapter, and 4 refers to the hard drive.

Read and write operation track number register 1 1 It is used to store the read and write track number obtained from the command sequence sent to the hard disk adapter when reading and writing from the computer. In the AT bus standard, 1 F 5, 1 F 4 (or 1 7 5, 1 7 4) are the IIO addresses of the hard disk read and write track numbers. In other hard disk interface standards, you can also use the command sequence Analyze the read and write track numbers.

Toggle switch 1 3 is used to set the first and last track number (track group) of the protected area of the hard disk. The area between the two track numbers can actually be regarded as a logical disk. Important files such as system files are stored between the two tracks or on the logical disk, and the hard disk cannot be read or written at will by the hardware protection. The most important data in your computer is uncorrupted. A set of first and last track numbers can set a protected area. For simplicity, a protected area is often set from the head (or tail) of the disk. In this case, only one track number can be used to represent the protected area. In addition, multiple track groups can be set by the toggle switch. Define multiple protected areas.

The comparison circuit 12 is used to compare the track number of the current read and write operation stored in the read and write operation track register with the first and last track numbers of the track group set by the toggle switch to determine the track of the read and write request. Whether the number falls within the set protected area, that is, it is judged whether the read / write request is legal, and the comparison result is sent to the judgment logic module 14.

In order to more user-friendly, the present embodiment is provided with a mechanical lock ^17, the lock 17 is turned on when the control means even lose control, i.e., that the decision logic can always output as a signal the reader shoving, Conversely, the read-write control device can make the control function normally.

The decoding circuit 15 generally refers to a decoding circuit that may be used by the standby unit, because it is familiar to those skilled in the art and will not be repeated here.

The OR gate 16 is used as a read-write operation inhibiting component in this embodiment. When the judgment logic module 1 4 outputs a high-level signal, the output of the OR gate ¹⁶ is high-level, and the level of the OR is When sent to the hard disk adapter 3, the read and write operation commands sent from the bus to the hard disk adapter can be blocked, thereby prohibiting reading and writing to the hard disk.

The judging logic module 1 4 finally determines whether the current read and write i request is legal according to the input of the comparator 1: and the lock 1 7, that is, whether it is a read and write i request to the protected area of the hard disk. When it is judged to be illegal, it outputs a high-level signal to cause the OR gate 16 to block read and write operations. Otherwise, it outputs a low-level signal to enable normal read and write operations.

In this embodiment, it is judged whether the read and write request is legal by judging whether the read-write iQiuqiu magnetic number falls within the protected area set by the toggle switch, and the read-write operation is prohibited through the OR gate 16. In fact, after judging the legality of a reading and writing strategy, there are various ways to prohibit illegal reading and writing, which is contained in the above-mentioned European patent application 9 3 1 0 3 7 4 5. 1 belonging to the applicant. There is a more detailed introduction, this patent application is hereby incorporated by reference.

In this embodiment, a mechanical device such as a toggle switch 1 3 is used to set the first and last track numbers of the protected area, and the first and last track numbers can also be set electrically to set the protected area.

FIG. 2 is a schematic diagram of a hard disk read-write control device used in a computer system according to another embodiment of the present invention. The same reference numerals in FIG. 2 as those in FIG. 1 refer to the same parts as those in FIG. 1 and they will not be described again.

Figure 2 differs from Figure 1 in that register 13 'is used to replace the toggle switch 13. This register is used to store the track number group that defines the protected area of the hard disk. In this state, the first and last track numbers of the protected area are sent to this register 1 3 '. The best way is to put data into this register through application software when the computer starts up, and then turn off this advice so that its content cannot be changed at any time in the future. Of course, you can also set the password to change the contents of this register at any time after booting. 伹 This will reduce the security of the hard disk.

In the above embodiment, the information (reading track number) used to determine the legitimacy of the read and write request sent by the computer is obtained from the bus when the computer sends a read and write command to the disk adapter. In fact, the information can also be Taken from the cable between the hard disk adapter and the hard drive.

Similarly, in the above-mentioned embodiment, the use of the yoke read and write command to the hard disk adapter is prohibited, and illegal reading and writing is prohibited. When it is determined that the read and write operation is illegal, the data of the hard disk adapter is blocked from being transmitted to the hard disk drive (Such as connecting the output of the OR gate 16 to the hard disk drive) or generating a reset signal to the hard disk adapter so that the hard disk adapter cannot perform illegal work when the read / write status is illegal is prohibited.

The hard disk read-write control device of the present invention can be made into a single card, can also be used on a display card or a communication card, or can be combined with a kind of computer multimedia card to form a card, or it can be combined with a computer main board to form a card. ALL-IN-ONE main lever. A better way recommended by the applicant is to make the hard disk read-write control device and the hard disk adapter of the present invention into a dedicated chip, that is, to manufacture a hard disk adapter unit that can judge whether the hard disk read-write operation is legal to determine whether to perform .

The device for controlling read and write operations of the hard disk has been described above, but the protection level of the hard disk protection area can be specifically selected through application software according to requirements, that is, unreadable and writable or readable and writable.

The above description only describes the contents of the present invention with respect to two embodiments. It is not difficult for those skilled in the art to make various modifications or modifications based on the teachings of the present invention. Therefore, the present invention attempts to limit the present invention with the following requirements. range.

Claims

Request for Profit

1. A computer hard disk read-write control device, comprising:

Device for setting first and last track numbers of protected area of hard disk;

Device for storing track numbers of hard disk read and write operations;

A legitimacy judging device, configured to compare the track number stored in the device that stores read and write operations as track numbers with the first and last track numbers of the protected area set by the setting device to determine the read and write operation tracks Whether the number falls into the protected area to determine whether the read and write operation is legal;

The illegal operation prohibition device is configured to allow the read / write operation to be performed when legal, and prohibited to perform the illegal operation according to a result determined by the judging device.

2. The device according to claim 1, further comprising a lock for setting a working state of the device, and when the lock is closed, the read-write control device is in an effective state, and the read-write control can be performed according to The operation i determines the legality of the request to control the read and write operations on the hard disk. When the lock is turned on, the read and write control device is in an invalid state and cannot interfere with the hard disk read and write operations.

3. The device according to claim 1, characterized in that the track number of the hard disk read-write operation is obtained from the bus when the computer sends a read-write command to the hard disk adapter through the bus.

4. The device according to claim 1, wherein the track number of the hard disk read-write operation is obtained from a read-write signal transmitted from the hard disk adapter to the hard disk drive.

5. The device according to claim 1, characterized in that said setting device includes a toggle switch.

6. The device according to claim 1, wherein the setting device includes a register for storing the first and last track numbers of the protected area.

7. The device according to claim 1, wherein the setting device can set multiple protected areas of the hard disk, that is, set multiple sets of first and last track numbers to define multiple protected areas respectively.

8. The device according to claim 1, which is characterized in that the device together with the hard disk adapter is made into a hard disk drive unit with a function of judging whether the hard disk read and write is legal.