Hitachi HTS543280L9SA00, HTS543232L9A300, HTS543225L9A300 manual 6.3.6.4Test considerations

5K320 SATA OEM Specification

turned off, emergency unload occurs, as well as the problems cited in section 5.1, "Data loss by power off" and section 5.2, “Write Cache”.

6.3.6.4Test considerations

Start/stop testing is classically performed to verify head/disk durability. The heads do not land on the disk, so this type of test should be viewed as a test of the load/unload function.

Start/Stop testing should be done by commands through the interface, not by power cycling the drive. Simple power cycling of the drive invokes the emergency unload mechanism and subjects the HDD to nontypical mechanical stress.

Power cycling testing may be required to test the boot-up function of the system. In this case HItachi recommends that the power-off portion of the cycle contain the sequence specified in section 6.3.6.2, "Required Power-Off Sequence”. If this is not done, the emergency unload function is invoked and nontypical stress results.

31