| US 7,538,970 B2 | ||
| Storage apparatus, storage apparatus control method, and computer product | ||
| Takahiro Aoki, Kawasaki (Japan); Shunji Saitou, Kawasaki (Japan); and Takao Abe, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Dec. 29, 2005, as Appl. No. 11/322,025. | ||
| Claims priority of application No. 2005-276641 (JP), filed on Sep. 22, 2005. | ||
| Prior Publication US 2007/0064337 A1, Mar. 22, 2007 | ||
| Int. Cl. G11B 5/596 (2006.01) | ||
| U.S. Cl. 360—78.04 | 17 Claims |
| 1. A storage apparatus having a disk-like recording medium on which a plurality of tracks including a plurality of frames
is formed and a movable head that performs a data input/output with respect to the frames, the storage apparatus comprising:
a seek-information storing unit that stores seek information including a correlation between a seek distance and a seek time
based on an actual measurement, the seek distance indicating a shift distance from a current track to a target track where
a target frame for the data input/output is located, the seek time indicating a shifting time that it takes to shift the head
from the current track to the target track;
a rotational delay time calculating unit that calculates a rotational delay time that the head stands by until the target
frame arrives at a position of the head after the head arrives at the target track; and
a head-shift control unit that controls a shift of the head based on the rotational delay time and the seek time acquired
from the seek information, wherein
the head-shift control unit further obtains an estimated time by adding the rotational delay time to the seek time, and controls
the shift of the head from the current track to the target track based on the estimated time.
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