Computer Drive - Floppy Disk Drive User Manual

5.3 Host Commands

C141-E224 5-121

• SET MAX UNLOCK (Features Field = 03h)

This command requests a transfer of single sector of data from the host, and

defines the contents of SET MAX ADDRESS password.

The password supplied in the sector of data transferred shall be compared with the

stored password.

If the password compare fails, the device returns command aborted and

decrements the Unlock counter, and remains in the Set Max Lock state. On the

acceptance of the SET MAX LOCK command, the Unlock counter is set to a

value of five. When this counter reaches zero, then SET MAX UNLOCK

command returns command aborted until a power cycle.

If the password compare matches, then the device makes a transition to the Set

Max Unlocked state and all SET MAX commands will be accepted.

• Error reporting conditions

(1) The device is in Set Max Locked mode or Set Max Freeze Locked mode

(ST = 51h, ER = 04h).

(2) The device is in Set Max Unlocked mode (ST = 51h, ER = 04h).

(3) A SATA communication error occurred (ST = 51h, ER = 14h).

At command issuance (Shadow Block Registers setting contents)

CM 1 1 1 1 1 0 0 1

DH x x x x xx

At command completion (Shadow Block Registers contents to be read)

ST Status information

Error information