Western Digital Ultrastar DC HC310 - Figure 12 Usual Operation

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Western Digital Hard Disk Drive OEM Specification
9.6.4.3 Operation from POR after User Password is Set
When Device Lock Function is enabled, the device rejects media access command until a Security Unlock command
is successfully completed.
(*1) Refer to 9.6.5 on the page.52
Figure 12 Usual Operation
POR
Device Locked mode
Unlock CMD Erase Prepare Media access
command (*1)
Non-Media access
command (*1)
Password
Match ?
Complete
Erase Unit
Lock function
Disable
Enter Device
Unlock mode
Erase Unit
Password
Match ?
Normal operation : All commands are available
Freeze Lock command
Enter Device Frozen mode
Normal Operation except Set Password,
Disable Password, Erase Unit, Unlock commands.
Reject
Complete
N
Y
N
Y