Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Patent
1991-04-03
1993-10-12
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data verification
371 51, G11B 509
Patent
active
052531260
ABSTRACT:
A method for monitoring the performance of a DAT drive and a method for self-cleaning the tape heads of a DAT drive pursuant to the occurrence of an error that could not be corrected by re-reads or re-writes. The monitoring method includes the steps of (a) reading a tape, (b) determining for each of successive groups of frames respective A track and B track reference error counts representative of the A track and B track C1 error counts in each group of frames, each group having the same number of frames, and (c) providing a warning signal indicative of degraded performance if (i) either the A track reference counts for a predetermined number of consecutive frame groups exceed a predetermined threshold or the B track reference counts for a predetermined number of consecutive frame groups exceed a predetermined threshold, or (ii) if both the A track and B track reference counts for the predetermined number of consecutive frame groups exceed the predetermined threshold. The self-clean procedure includes the steps of moving the tape to the end of the tape at a speed higher than normal, moving the tape to the beginning of the tape at a speed higher than normal, positioning the tape at the location of the error, providing a warning to the user, and resuming the operation that resulted in occurrence of the error. If the error persists, the user is notified of the occurrence of an uncorrectable error.
REFERENCES:
patent: 5113397 (1992-05-01), Kaaden et al.
patent: 5124986 (1992-06-01), Sudoh et al.
Archive Corporation
Canney Vincent P.
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