Mitsubishi Electric Apricot LS660 Owner's Handbook Manual page 45

Optional PD drive
Hard disk drive
Check the type of media in the drive, CD or PD disk cartridge.
Remember that the PD cartridge needs the disk inside to be
formatted to allow it to be written to. Check, as with a floppy drive,
that the cartridge is not write protected.
Make sure that you are trying to access the drive by the correct icon
for the media in use.
If you encounter problems accessing any IDE hard disk drive, use
the BIOS Setup utility to check that the drive is correctly specified,
and that the drive's controller is enabled. Check also that the disk
has been correctly formatted, and that the permission assigned by
the operating system allow the intended access.
SCSI drives
If you have just fitted a new SCSI drive, or device, check that you
have used a valid 'ID' that does not conflict with other SCSI drives
or devices is the system. Look in any documentation for
information.
On boot up, just after POST, a list is displayed of the devices
attached to the SCSI interface, which shows the device, its
parameters and the set 'ID'.
T r o u b l e s h o o t i n g
LS/VS660 OWNER'S HANDBOOK 5/7