SU777654A1 - Device for control of magnetic disk-based storage - Google Patents

Description

The essence of the technical solution is that the control unit performs the procedure of initializing the disk packets by hardware. By the command “Markup indicating the place of the marked track, the device automatically controls the execution of installation operations, recording service information and recording test codes with subsequent repeated control reproduction of them. In the event of detection of defects in the coating, a copy of the information is rewritten to a new location. Such a shift can be carried out repeatedly.

The invention is illustrated by the drawing, which shows a block diagram of a device for controlling a magnetic disk drive.

The device contains a block / control (B, L), input bushes 2, register 3 own address, node 4 compare its own address, trigger 5 error P - space, trigger 6 error of its own address, trigger 7 psh - space trigger 8 error code, counter 9 revolutions, counter .10 shifts, counter 11 indexes, digests, code memory node 15, code comparison node 16, link 17 of control unit with control panel. In the control unit there are group output M, group inputs 19-21, outputs 22-30, inputs 31-34. Decipher 12 has output 35 and group output.

The device works as follows.

. In boxes 2 in control unit 1, a track mark command is received that determines the appropriate mode of operation of the device. After receiving the command, the CU outputs to the accumulator the signals necessary to set the head on a given disk track; At the same time, the contents of the private address are transferred from group exit 18 to register 3.

The markup of the track consists in the fact that at first the space Pb is written to it with its own address, the space Pz and the control code, and then several control plays are made. At the same time, the disk revolutions are counted by counting the track index signals from the accumulator to the counter: // through the bushes 17, the control unit and its output 30. The meter states // are separated by the decryptor 14 and transferred to the group input B 2.1.

After the first index, write mode is activated. In the process of recording on the selected Mjao track, the space Pb is filled with its own address coming from register 3 to the group entrance BU 3 /, the space Pg and the code coming from node 15 to the group input BU 33. After the countdown, the counter 11 of the second index starts playing, and control of the own address from the output of the control unit 27 to node 4, and for control of the code - from the output of the control unit 29 to the node 16. The control of gaps is performed in the control unit in the usual order, as in the prototype. Signals of the result of the control of its own, address and code go accordingly from output 4 to input 32 of the control unit, and from output of the node 16 to the input 34 of the control unit. In the case of a positive control result, if the entire track is played repeatedly, the control unit sends a message to the channel to communities 2 about the end of the track markup.

5 If an error is detected in Pi by the signal from output 22 of the CU, trigger 5 is activated, and at an error in its own address, the signal from the output of 23 CU turns on the trigger 6. The signals from the output of these triggers are transmitted to the counter & Whether the error was random. The replay of the checkout is performed using signals from the

5 from the output 56 of the counter 12. If the counter P counts another error and three revolutions of the disk, then the signal from the output 36 of the node 12 is transmitted to the counter 10. The states of the counter 1st are detected by the node / i5 and transmitted

0 group input 20 BU. The number of states to be decrypted is N. The control unit, having received the first of these signals, organizes a new entry on the track, with the buffer part PI increasing by the value of its own address plus the information part Pb, i.e., a shift is made along the track. If the entry in the new location is again in error, the shift is repeated. Maximum number of attempts

0 records of the own address and pi is equal to N. If, for all N attempts, errors are detected, then the packet is recognized as defective, which the control unit reports to the channel 2.

45 in the third case, when an error is detected in the gap or control code, signals from outputs 24 and 25 of the control unit, respectively, include 7 to 8 triggers. Signals from the outputs of these triggers are transmitted to counter 9 and, as in the previous case, an error check is performed. If the error was repeated on the second revolution, then in register 3 a sign of the defective track is entered and a new record of its own address is created that contains this sign.

Arranging the markup with the aid of this device improves productivity.

 computer system due to the release of the CPU from the execution of this function. In addition, it is possible to efficiently use a packet of disks that under normal conditions when 65 are known to be worthless.

Claims (2)

1. Device BS-6551. Technical description. SHYAZ 057.069.TO.TO1. 2. A device for controlling magnetic disk drives. Model 1Ш4, Technical Manual, translated from English. Department of funds NIITAIR. UDC 681. 327.64. Translation number M05 (prototype).