This PCMCIA portable 2x CD-ROM "PORTABLE CD_ROM XA DRIVE" was sold together with early notebooks as Toshiba Satellite, Compac etc. The drivers came on a diskette, easy to forget where it is. The comparatively slow drive (10 MB/min) may be essential for an old, good working machine, however. I tried my self for a long time to get the drive working before I found the disk provided by the seller.
Choose a:\ or the directory you choose for unpacked drivers (and readmee) files as the machine detects the new hardware.