Sony PCG-XG28 Primary User Manual page 43

If another device is in the multipurpose drive bay, remove the device.
See "To remove the floppy disk drive (Windows 98 models)" on
page 32 or "To remove the second battery pack" on page 55.
Insert the floppy disk drive into the multipurpose drive bay with the
VAIO logo facing up. Continue pushing the drive into the bay until
the RELEASE lever locks into place.
Hold the diskette with the label side facing up.
Gently push the diskette into the drive until it clicks into place.