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AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsThomas Young Chang, Louis Joseph Serrano
Estimating the term…
A direct access storage device (DASD) employs head-specific off-track read capability (OTRC) in data access operations. A method of operation of the DASD involves providing within the DASD a rotating data storage medium and one or more read heads positionable for interaction with the data storage medium. The OTRC particular to each read head is determined and then applied in accessing data from the data storage medium. One manner of applying the OTRC to access data is to use the OTRC in scheduling random queued seeks. The OTRC for a head is referenced within buffer memory and applied to determine which target data can be accessed most quickly. The seeks are scheduled accordingly. A single table with a nominal seek time can be used for all heads, with a custom adder being added for each particular head. The OTRC can also be applied to alter the seek algorithm. That is, a given seek operation can be conducted more aggressively where the head involved has more favorable OTRC and less aggressively where a head with a less favorable OTRC is involved.
A method for employing a customized off-track read capability (OTRC) value in accessing data on a direct access storage device (DASD), the method comprising:
A direct access storage device (DASD) comprising:
A direct access storage device (DASD) comprising:
Dependencies are inferred from the claim text.