Dynamic magnetic information storage or retrieval – General processing of a digital signal – Inter-record gap processing
Patent
1997-11-25
2000-09-12
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Inter-record gap processing
360 62, 360 63, G11B 509, G11B 1512
Patent
active
061186058
ABSTRACT:
The system for gap positioning optimization in a tape drive takes advantage of the presence of a pair of read heads, located one on either side of the write head, to precisely determine the boundary between the inter-block gap and the data blocks adjoining the inter-block gap. In particular, the servo mechanisms in the tape drive note the location of the boundary between the present data block and the inter-block gap formed a the end of the present data block. When the tape is repositioned between data read/write operations, this servo information is used to identify this boundary to initiate the subsequently received data read/write operation. A predetermined amount of inter-block gap is provided at the end of the data block to ensure that subsequently received data is not written on top of the present data block or the overwriting of the next data record begins at the beginning of the data block. The system for gap positioning optimization in a tape drive activates the upstream read head during the tape acceleration process to sense the location of this boundary. The upstream read head senses the presence of a region devoid of data, indicating the inter-block gap, thereby confirming the location of the boundary with more precision than the servo data indication, and positively verifying before the write operation that the selected block is the one desired.
REFERENCES:
patent: 4945437 (1990-07-01), Oguchi et al.
patent: 5307217 (1994-04-01), Saliba
patent: 5371638 (1994-12-01), Saliba
patent: 5675448 (1997-10-01), Molstad et al.
Call Mark Gregory
Hungerford Geoffrey
Whitney Bradley E.
Kim W. Chris
Storage Technology Corporation
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