IBM DJSA-210 Hard Drive Specifications - Page 163

Security Unlock F2h, If the Identifier bit is set to user

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13.25 Security Unlock (F2h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 - 1 D - - - - Command 1 1 1 1 0 0 1 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 0V000V00 Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 - - 0 -V Figure 101. Security Unlock command (F2h) This command unlocks the password and causes the device to enter device unlock mode. If a power on reset or hard reset is done without executing the Security Disable Password command after this command is completed, the device will be in device lock mode. The password has not been changed yet. The Security Unlock command requests to transfer a single sector of data from the host including information specified in Figure 101 on page 150. If the Identifier bit is set to master and the file is in high security mode then the password supplied will be compared with the stored master password. If the file is in maximum security mode then the security unlock will be rejected. If the Identifier bit is set to user, then the file compares the supplied password with the stored user password. If the password compare fails then the device returns an abort error to the host and decrements the unlock attempt counter. This counter is initially set to 5 and is decremented for each password mismatch. When this counter reaches zero, all password protected commands are rejected until there is a hard reset or a power off. Travelstar 32GH/30GT/20GN hard disk drive specifications 149

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13.25 Security Unlock (F2h)
see below
Status
1 1 1 1 0 0 1 0
Command
– – – – – – – –
Device/Head
1 – 1 D – – – –
Device/Head
– – – – – – – –
Cylinder High
– – – – – – – –
Cylinder High
– – – – – – – –
Cylinder Low
– – – – – – – –
Cylinder Low
– – – – – – – –
Sector Number
– – – – – – – –
Sector Number
– – – – – – – –
Sector Count
– – – – – – – –
Sector Count
see below
Error
– – – – – – – –
Feature
– – – – – – – –
Data
– – – – – – – –
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input Registers
Command Block Output Registers
V
–
0
–
–
0
V
0
0
0
V
0
0
0
V
0
ERR
IDX
COR
DRQ
DSC
DF
RDY
BSY
AMN
T0N
ABT
0
IDN
0
UNC
CRC
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Status Register
Error Register
Figure 101. Security Unlock command (F2h)
This command unlocks the password and causes the device to enter device unlock mode. If a power on
reset or hard reset is done without executing the Security Disable Password command after this command
is completed, the device will be in device lock mode. The password has not been changed yet.
The Security Unlock command requests to transfer a single sector of data from the host including
information specified in Figure 101 on page 150.
If the Identifier bit is set to master and the file is in high security mode then the password supplied will be
compared with the stored master password. If the file is in maximum security mode then the security
unlock will be rejected.
If the Identifier bit is set to user, then the file compares the supplied password with the stored user
password.
If the password compare fails then the device returns an abort error to the host and decrements the
unlock attempt counter. This counter is initially set to 5 and is decremented for each password mismatch.
When this counter reaches zero, all password protected commands are rejected until there is a hard reset
or a power off.
Travelstar 32GH/30GT/20GN hard disk drive specifications
149