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4.
Advanced usage using protected area
The data in the protected area is accessed by following.
Issue Read Native Max Address command to get the real device maximum LBA . Returned value shows that
native device Maximum LBA is 12,692,735 (C1ACFFh) regardless of the current setting.
Make entire device be accessible including the protected area by setting device Maximum LBA as
12,692,735 (C1ACFFh) via Set Max Address command with volatile option. By using this option, unexpected
power removal or reset will not make the protected area remained accessible.
Read information data from protected area.
Issue hard reset or POR to inhibit any access to the protected area.
9.7.2
Security Extensions
1. Set Max Set Password
2. Set Max Lock
3. Set Max Freeze Lock
4. Set Max Unlock.
The Set Max Set Password command allows the host to define the password to be used during the current power on
cycle. The password does not persist over a power cycle but does persist over a hardware or software reset. This
password is not related to the password used for the Security Mode Feature set. When the password is set the
device is in the Set_Max_Unlocked mode. The Set Max Lock command allows the host to disable the Set Max
commands (except set Max Unlock) until the next power cycle or the issuance and acceptance of the Set Max
Unlock command. When this command is accepted the device is in the Set_Max_Locked mode. The Set Max Unlock
command changes the device from the Set_Max_Locked mode to the Set_Max_Unlocked mode. The Set Max
Freeze Lock command allows the host to disable the Set Max commands (including Set Max UNLOCK) until the next
power cycle. When this command is accepted the device is in the Set_Max_Frozen mode.
The IDENTIFY DEVICE response word 83, bit 8 indicates that this extension is supported if set, and word 86, bit 8
indicate the Set Max security extension enabled if set.
Western Digital Hard Disk Drive OEM Specification
56
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