| US 7,613,525 B2 | ||
| Disk device for serial communication and method of controlling the same | ||
| Kenji Ogasawara, Kanagawa (Japan); and Hirofumi Saitoh, Kanagawa (Japan) | ||
| Assigned to Hitachi Global Storage Technologies Netherlands B.V., Amsterdam (Netherlands) | ||
| Filed on Sep. 19, 2005, as Appl. No. 11/231,155. | ||
| Claims priority of application No. 2004-287819 (JP), filed on Sep. 30, 2004. | ||
| Prior Publication US 2006/0080483 A1, Apr. 13, 2006 | ||
| Int. Cl. G11B 15/46 (2006.01); G11B 5/596 (2006.01); H02P 1/00 (2006.01); H02P 1/04 (2006.01); G05B 11/01 (2006.01); G05B 19/18 (2006.01) | ||
| U.S. Cl. 700—1 [318/268; 318/255; 318/430; 318/560; 318/569; 360/73.03; 360/78.07] | 15 Claims |
| 1. A disk device comprising:
a serial communication circuit which executes serial communication with an external device;
a spindle motor which rotates a disk; and
a controller which controls said spindle motor and said serial communication circuit;
wherein said controller initiates communication with said external device by said serial communication circuit when a rotation
speed of said spindle motor is a specified reference value or over;
wherein said controller starts up rotation of the said spindle motor after suspending by stopping the operational clocks of
at least part of said serial communication circuit, if said serial communication circuit is already activated, when starting
up said spindle motor.
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