Hitachi HTS541660J9SA00, HTS541640J9SA00 Command Table, Attempt limit for SECURITY UNLOCK command

Travelstar 5K160 (SATA) Hard Disk Drive Specification

Figure 13 Password Lost

12.9.1.4 Attempt limit for SECURITY UNLOCK command

The SECURITY UNLOCK command has an attempt limit. The purpose of this attempt limit is to prevent that someone attempts to unlock the drive by using various passwords many times.

The device counts the password mismatch. If the password does not match, the device counts it up without distinguishing the Master password and the User password. If the count reaches 5, EXPIRE bit(bit 4) of Word 128 in Identify Device information is set, and then SECURITY ERASE UNIT command and SECURITY UNLOCK command are aborted until a power off. The count and EXPIRE bit are cleared after a power on reset.

12.9.6Command Table

This table shows the device’s response to commands when the Security Mode Feature Set (Device lock function) is enabled.

Command		Device	Device	Device
		Locked	Unlock	Frozen
		Mode	Mode	Mode
Check Power Mode		o	o	o
Device Configuration RESTORE		x	o	o
Device Configuration FREEZE LOCK		o	o	o
Device Configuration IDENTIFY		o	o	o
Device Configuration SET		x	o	o
Execute Device Diagnostic		o	o	o
Flush Cache		x	o	o
Flush Cache Ext		x	o	o
Format Track		x	o	o
Format Unit		x	o	o
Identify Device		o	o	o
Idle		o	o	o
Idle Immediate		o	o	o
Initialize Device Parameters		o	o	o
Read Buffer		o	o	o
Read DMA		x	o	o
Read DMA Ext		x	o	o
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