Hitachi HTS541612J9SA00 manual Diagnostic and Reset considerations, Power-off considerations

	Travelstar 5K160 (SATA) Hard Disk Drive Specification
Alternate Status		50h

Figure 6 Default Register Values

The meaning of the Error Register diagnostic codes resulting from power on, COMRESET or the Execute Device Diagnostic command are shown in the following table.

Code	Description
01h	No error Detected
02h	Formatter device error
03h	Sector buffer error
04h	Ecc circuitry error
05h	Controller microprocessor error

Figure 7 Diagnostic Codes

12.2 Diagnostic and Reset considerations

The Set Max password, the Set Max security mode and the Set Max unlock counter don’t retain over a Power On Reset but persist over a COMRESET or Soft Reset.

For each Reset and Execute Device Diagnostic, the Diagnostic is done as follows:

Execute Device Diagnostic

In all the above cases: Power on, COMRESET, Soft reset, and the EXECUTE DEVICE DIAGNOSTIC command the Error register is shown in the following table.

Device 0 Passed

Yes

No

Error Register

01h

0xh

Where x indicates the appropriate Diagnostic Code for the Power on, COMRESET, Soft reset, or Device Diagnostic error.

Figure 8 Reset error register values

12.3 Power-off considerations

12.3.1Load/Unload

Load/Unload is a functional mechanism of the HDD. It is controlled by the drive microcode. Specifically, unloading of the heads is invoked by the commands:

Command

Standby

Standby immediate

Sleep

Response

UL -> Comp.

UL -> Comp.

UL -> Comp.

“UL” means “unload”.

“Comp” means “complete”.

Figure 9 Device’s behavior by ATA commands

Load/unload is also invoked as one of the idle modes of the drive.

The specified start/stop life of the product assumes that load/unload is operated normally, NOT in emergency mode.

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