System for handling missed revolution in a disk drive by aborting the execution of primary command and executing secondary command if a missed revolution occurs
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United States of America Patent
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Jul 11, 1997
filing date -
Jul 11, 1997
priority date (Note) -
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Abstract
A method and disk controller for handling missed revolutions in a disk drive having a rotating data media are disclosed. The method is based on a Rotational Positioning Optimization (RPO) algorithm and comprises the steps of: selecting a primary and a secondary command from the queue using the RPO while a current command is being executed; executing the primary command after the current command is completed; if a missed revolution occurs, then aborting the execution of the primary command and executing the secondary command; and repeating the method steps until all the commands in the queue are executed. Preferably, the RPO algorithm is based on a profile of estimated seek times for the commands in the I/O command queue. The method uses a generally aggressive seek time estimate in selecting a primary command and a generally conservative estimate is used for selecting a secondary command. Accordingly, the missed revolutions can be avoided and system performance is improved.
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