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MODE SELECT 15h/55h
Commands
95
MODE SELECT This flag can be used to switch the drive between normal operation and
CD-ROM emulation mode:
• If this bit is set to its existing value, there is no change.
• If this bit is changed from 0 to 1, the drive will enter CD-emulation
mode. It will change its Inquiry and Mode data appropriately and
cache the first 250 KB of the CD image off tape. CD-ROM support
commands will be enabled. This transition is primarily present to
support automated functional testing.If the bit is changed from 1 to
0, the drive leaves CD-ROM emulation mode and reverts to normal
tape drive mode.
• If this bit is changed from 1 to 0, the drive will leave CD-emulation
mode. The Inquiry and Mode data will revert to that for a tape drive
and CD-ROM command support will stop. The tape will be reloaded
and the logical position will be BOP. Backup applications can use
this transition to switch to a normal mode of operation for file system
recovery off tape. Note that operating systems that pre-load class
drivers at boot might not be prepared to talk to the erstwhile CD-
ROM drive