FUJITSU MHZ2250BJ - Manual (Page 205)

5.3 Host Commands
(32) SECURITY ERASE UNIT (X 'F4')
This command erases all user data. This command also invalidates the user
password and releases the lock function.
The host transfers the 512-byte data shown in Table 5.38 to the device. The device
compares the user password or master password in the transferred data with the user
password or master password already set. The device erases user data, invalidates
the user password, and releases the lock function if the passwords are the same.
Although this command invalidates the user password, the master password is
retained.
To recover the master password, issue the SECURITY SET PASSWORD
command and reset the user password.
Table 5.38 Contents of Security Erase Unit Password
Word Contents
0 Control Word
0 = Compares the user passwords
0 = Normal Erase
Bit 0: Identifier
1 = Compares the master passwords
Bit 1: Erase mode
1 = Quick Erase
Bit 2 to 15: Reserved
1 to 16 Password (32 bytes)
17 to 255 Reserved
C141-E280 5-131