Travelstar 5K160 (SATA) Hard Disk Drive Specification
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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.
12.9.6
Command Table
This table shows the device’s response to commands when the Security Mode Feature Set (Device
lock function) is enabled.
Command Device
Locked
Mode
Device
Unlock
Mode
Device
Frozen
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
