Recovery of stored data from mutilated tape data blocks

Details Recovery of stored data from mutilated tape data blocks Recovery of stored data from mutilated tape data blocks

1985-04-12

1987-11-03

Shaw, Gareth D.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

G11B 509, G11B 2018

Patent

active

047046414

ABSTRACT:
Disclosed is a tape controller (105) that recovers data from a block (203b) of data stored on magnetic tape (109) that has been affected in part by uncorrectable errors such as tape blemishes (213). Upon receiving a request for the block of data, the controller causes a tape drive (108) to read the block from the tape. The controller stores the read data in a buffer memory (111) that is at least the size of the data block. When the tape drive encounters the affected data while reading the block of data, the controller clears the buffer memory and causes the drive to read the block in reverse. The controller again stores the read data in the buffer memory, in the order in which they are read. When the drive again encounters the affected data, the controller reverses the contents of the buffer memory and then causes the drive to read the block in forward. The controller once more stores the read data in the buffer memory, thereby concatenating the two data portions. When the drive again encounters the affected data, the controller provides the contents of the buffer memory to a requestor in response to a request for the block of data.

REFERENCES:
patent: 3261003 (1966-07-01), Cogar et al.
patent: 3579211 (1971-05-01), Larsen
patent: 3771125 (1973-11-01), Nagahori et al.
patent: 3930234 (1975-12-01), Queisser et al.
J. W. Irwin, "Recovery From Write Check Conditions", IBM Technical Disclosure Bulletin, vol. 15, No. 9, Feb. 1973, pp. 2946-2947.

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