Commands
94
CD-ROM Emulation/Disaster Recovery mode page
This page can be used irrespective of whether the drive is acting as a tape or a CD device.
CD-ROM Emulation/Disaster Recovery mode page fields:
Current Power-on
Count
The number of times the drive has been
powered on
Ignored
Power-on Time
The number of seconds since the drive
has been powered on
Ignored
World Time
The number of seconds from 00:00:00
on January 1, 1970
Ignored if WT = 0
UTC
0 The local timezone has been used. Ignored if WT is 0
Set to 1 if UTC World Time is being used.
1h World Time is UTC.
NTP
0 Unsure if NTP-synced
Ignored if WT is 0
Set to 1 if World Time is NTP-synced.
1h World Time is set from NTP source.
Library Time
The time in hrs:mins:secs set by the
library controller
Ignored
MODE SENSE
MODE SELECT
7
6
5
4
3
2
1
0
0
Page Code {3Eh}
1
Page Length {02h}
2
Reserved (0)
Non-Auto CDmode
3
Reserved (0)
Non-Auto
When a system restarts after booting off tape, the drive detects the SCSI resets issued
during reboot and, in conjunction with knowing that more than 100 blocks have been
read in CD-ROM emulation mode, will revert back to behaving as a tape device. This is
the standard method by which the drive automatically reverts to being a tape drive in
order that a backup application can do file system recovery. The method of reversion
involves a firmware reboot, so the drive might become unavailable for a few seconds
during its “power-on” following the SCSI reset. (Note that normal SCSI reset response does
not involve a firmware reboot).
Setting this flag to 1 inhibits this automatic return to tape drive behavior; the drive will
remain in CD-ROM mode irrespective of blocks read and SCSI resets.
CDmode
MODE SENSE
0 The drive is in tape drive mode.
1 The drive is in CD-ROM emulation mode.
