Sony PCG-XG28 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.
In Windows 2000 models, you cannot insert/remove the disk drive when
the computer is in power saving mode, as a malfunction may result. In
Windows 98 models, you can also connect the floppy disk drive while in
power saving mode.
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.