On-the-fly splitting of disk data blocks using timed sampling of

Details On-the-fly splitting of disk data blocks using timed sampling of On-the-fly splitting of disk data blocks using timed sampling of

1992-09-10

1993-12-28

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 51, G11B 509

Patent

active

052745090

ABSTRACT:
A disk in a disk drive has radial spokes wherein servo bursts are recorded, and multiple concentric bands holding data blocks in pre-defined block frames. To maximize data density, the data rate in each band is proportional to the band radius, and the ratio of block frames to spokes in a given band may be non-integral. In such bands, some data blocks are split by a spoke. A disk controller in the disk drive uses a byte position accumulator (BPA) when splitting a data block. During the transfer of a data block, the BPA counts at the nominal data transfer rate to continually identify by its position in the data block a byte therein to be transferred shortly. The BPA output feeds a latch which is normally open to receive the BPA output. A timer within the disk controller establishes the rotational time at which the data transfer must be suspended to avoid a spoke. The timer generates an early warning signal in advance of this time which closes the latch. The value in the closed latch is the position of the last data byte to be transferred before the split. A comparator indicates when a count of bytes transferred has reached the value in the latch; the data transfer is then suspended until the spoke has passed.

REFERENCES:
patent: 4241420 (1980-12-01), Fish et al.
patent: 4366512 (1982-12-01), Janak et al.
patent: 4424543 (1984-01-01), Lewis et al.
patent: 4734901 (1988-03-01), Murakami
patent: 4811280 (1989-03-01), Berkowitz et al.
patent: 4858034 (1989-08-01), Hassel et al.
patent: 4949200 (1990-08-01), Weng
patent: 5073834 (1991-12-01), Best et al.
patent: 5150262 (1992-09-01), Kosokawa et al.
patent: 5230067 (1993-07-01), Buch
P. J. Badum, On-The-Fly Inter Record Gap Formation, vol. 11, No. 8, Jan. 1969, IBM Technical Disclosure Bulletin.
Kirk, Christianson, and Faizullabhoy, "Embedded Intelligence", BYTE vol. 17, No. 3, Mar. 1992, pp. 195-203.

Affiliated with

Also associated with

Rating

On-the-fly splitting of disk data blocks using timed sampling of does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with On-the-fly splitting of disk data blocks using timed sampling of, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On-the-fly splitting of disk data blocks using timed sampling of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1547589