Sony PCG-XG18 Primary User Manual page 42

You can use the supplied floppy disk drive either as an external drive or
as an internal drive in the drive bay.
You do not need to shut down the computer before connecting the floppy
disk drive. You can also connect the floppy disk drive while in power
saving mode. See also "To insert/to remove the disk drive while in power
saving mode" in the online manual.
Connect the floppy disk drive to the computer using the floppy disk
drive cable (supplied) with the VAIO logo facing up.
Align the logo on the cable with the slot connection and insert the
connector straight into the slot.