Read/write head buffer

Details Read/write head buffer Read/write head buffer

G - Physics

06

F

352/20, 354/241

G06F 12/00 (2006.01) G06F 13/00 (2006.01) G06F 13/362 (2006.01) G06F 11/10 (2006.01)

Patent

CA 2008522

READ/WRITE HEAD BUFFER ABSTRACT The read/write head buffer provides a buffer memory (207) for each read/write head (110-0) in the rotating media data storage system (120) that stores the entire track of data that includes the requested data record. Thus, the read/write head buffer retrieves the requested data record independent of the control module (106) so that a seek request from the processor (100) can be handled as soon as the beginning of the next data record stored on the track is positioned below the associated read/write head (110-0). The entire track is thereby staged faster on the average than the time to retrieve the requested data record. The read/write head buffer includes an address mark detection circuit (214) to identify the beginning of the data field in each data record. The address mark is a predetermined data pattern of n bits that is written on the track a predetermined distance in advance of the data field of the data record. The address mark detection circuit (214) compares the n data bits most recently read from the track with this predetermined data pattern of n bits as stored in memory. Once a match is detected, the buffer (207) is enabled to store the next data record written on the track and all subsequent data records on the track.

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