Hitachi C4K60 Specifications - Page 18
Required Power Off Sequence
UPC - 683728199449
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3.4. Load/Unload Specifications Load /Unload is a mechanism to load/unload the heads on the disk surfaces. 3.4.1. Normal Load/Unload Normal load/unload operations are limited to maximum 600,000 times during HDD life. The normal unload operation is performed by the following commands. - Standby - Standby Immediate - Sleep Also, the normal unload is automatically performed by control software, during Idle mode. The above normal unload time does not include an emergency unload as explained in Sec. 3.4.2. 3.4.2. Emergency Unload The emergency unload is occurred by unexpected power down, and is limited to maximum 20,000 times during HDD life. Since normal unload can not be performed by the software control after power off, the heads are unloaded by a hardware control. The maximum number of emergency unload is defined separately. 3.4.3. Required Power Off Sequence To operate the load/unload normally, the following BIOS sequence is required by Host system before power off. [Sequence #1]: Execute one of following commands. - Standby - Standby Immediate - Sleep Note: Such as Soft Reset, Flush Cache command or Check Power Mode command does not unload the heads. [Sequence #2]: Check the Status Register, and wait the command complete. Note: The head is unload by the sequence #1 command, and the command completion normally takes about 1sec. Considering the error retries, BIOS timer should be set to over 30 sec by the Host side. [Sequence #3]: Power off the drive Above sequence is required for the Host system at Power off, Suspend and Hibernation operations. K6610170 Rev.2 Dec 22, 2004 - 18 -