![background image](http://html2.mh-extra.com/html/quantum/dlt-s4/dlt-s4_reference-manual_3531879239.webp)
Chapter 4 SCSI Commands
MODE SENSE (6) / (10) Command (1Ah / 5Ah)
DLT-S4 Interface Reference Guide
205
General Operation
4
The password(s) are written to the drive using a
MODE SELECT
command
for the Vendor-Unique Data Security Mode page. The password value
will not be returned in the
MODE SENSE
data. The drive will create
password protected tapes as instructed by the Action Code of the
MODE
SELECT
command.
At the end of the load process there is a determination if the tape is
password protected. If the tape is password protected, the password(s) on
06h
Remove Password from the tape. Tape must be mounted and the drive
password(s) must match the tape password(s). This action clears the APB,
APD, and the appropriate TPP bits. The drive password is not cleared from
drive memory.
07h
Clear Drive Password. This action clears the APB, APD and corresponding
DPS bits, and the password from drive memory. If a password protected
tape is loaded, the appropriate PMM bit will be set. Password field is
ignored.
08h-3Fh
Reserved
Number of
Passwords
Supported
This read only four bit field indicates the number of passwords supported. This field is
currently set to two: one for the host interface and one for the automation interface.
However, this design can handle up to 8 passwords.
APB
Auto Password Blank Tapes. This read only bit indicates password protection mode for
this password is set to auto-password protect all blank tapes.
APD
Auto Password Unprotected Data Tapes. This read only bit indicates password protection
mode for this password is set to auto-password protect all unprotected/formatted tapes.
PA
Password Accessible on this interface. This read only status bit indicates if this password is
accessible from this interface.
TPP
Tape Password Protected. This read only bit indicates if this tape is password protected
with this password.
DPS
Drive Password Set. This read only bit indicates if the drive has a password set for this
interface.
PM
Password Mismatch. This read only bit indicates that this password on the tape does not
match this password set in the drive.
Password
This is a 32 byte write only field used to set the drive password to the desired value for the
requesting interface. The password value is secret and will not be reported in
MODE
SENSE
data. Instead, the password reported by the
MODE SENSE
command is all zeroes. For
actions other than 00 or 05, the password must be non-zero or the command will be
rejected. The password is cleared using action code 05 – Clear Drive Password
Field
Description