Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1993-05-18
1994-11-15
Hajec, Donald
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 53, G11B 509
Patent
active
053653823
ABSTRACT:
A method and apparatus for identifying and synchronizing to two different fields in a disk drive employs different synchronization or "sync" patterns to reduce the chances of mis-identifying and false-identifying a field. Two very distinct synchronization patterns have been found that satisfy the d=1, k=7 run-length constraints of a data code used in the disk drive. During operation, one sync pattern is searched for to identify and synchronize to its associated field, then the field itself is read. This procedure is then repeated for the other sync pattern and its associated field. Also, the phase of a preamble preceding each sync character is established, so that the number of comparisons needed to find either sync character is reduced. A sync detector operates on cell pairs, and has a selector that selects which sync pattern to search for. The sync detector also has special features that enable it to find preamble and DC Erase fields in the disk cell stream.
REFERENCES:
patent: 3916440 (1975-10-01), Irwin
patent: 4081844 (1978-03-01), Devore et al.
patent: 4470148 (1984-09-01), Mott et al.
patent: 4713802 (1987-12-01), Kobatov et al.
patent: 4719523 (1988-01-01), Kutaragi
patent: 4734901 (1988-03-01), Murakami
patent: 4748611 (1988-05-01), Tsuyoshi et al.
patent: 4768108 (1988-08-01), Higurashi
patent: 4862443 (1989-08-01), Tsuji et al.
patent: 4907215 (1990-03-01), Sako et al.
patent: 4937843 (1990-06-01), Takemoto
patent: 4977472 (1990-12-01), Volz et al.
patent: 4987355 (1991-01-01), Leaper et al.
patent: 5036408 (1991-07-01), Leis et al.
patent: 5054035 (1991-10-01), Tarallo et al.
patent: 5109393 (1992-04-01), Saegusa
patent: 5123013 (1992-06-01), Hirayama
patent: 5226026 (1993-07-01), Oshiba
patent: 5229986 (1993-07-01), Mizokami et al.
Kastner Michael E.
Leshay Bruce
Weng Lih-Jyh
Cefalo Albert P.
Digital Equipment Corporation
Hajec Donald
Hudgens Ronald C.
Minh Le Thien
LandOfFree
Synchronization to different fields in a storage device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Synchronization to different fields in a storage device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronization to different fields in a storage device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1102060