Data recording/reproducing apparatus employing read-after-write

Details Data recording/reproducing apparatus employing read-after-write Data recording/reproducing apparatus employing read-after-write

1996-06-27

2000-10-31

Loomis, Paul

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

714704, 714758, 714805, G11B 509, G06F 1100, H03M 1300

Patent

active

061411647

ABSTRACT:
A recording apparatus provided on, for example, a digital audio tape recorder or on a data storage device for correctly and reliably recording data. An ECC unit 23 appends the parity for error correction to recording data and transmits the resulting data to recording heads Hw1, Hw2, while recording the parity in a RAM 61. The recording data and the parity are reproduced from a magnetic tape 32 by magnetic heads Hr1, Hr2 and supplied to a subcode separation unit 45. A syndrome detection unit 62 detects the number of error corrections performed by parity by an error correction unit 46. A system controller 63 compares the number of times of error corrections to a threshold value and compares the parity read out from the RAM 61 to the parity from the sub-code separation unit 45 in order to detect if the recording data has been recorded correctly. If the recording data has not been recorded correctly, the system controller controls a recording/reproducing unit 30 for re-recording the same recording data.

REFERENCES:
patent: 4849979 (1989-07-01), Maccianti et al.
patent: 5359468 (1994-10-01), Rhodes et al.

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