PARAMBLOCK 

Contains information about locked drives.

PARAMBLOCK struc
    Operation db ?
    NumLocks  db ?
PARAMBLOCK ends
 

Members

Operation

Operation to carry out provided by the calling application of Lock/Unlock Removable Media (Interrupt 21h Function 440Dh Minor Code 48h). This member can be one of these values:

 

0

Locks the volume in the drive.

1

Unlocks the volume in the drive.

2

Returns the lock or unlock status.

 

All other values are reserved.

NumLocks

Number of locks pending on the given drive filled in by Lock/Unlock Removable Media.