525drive.com 5.25" 1.2MB Opt/device Driver Diskette
Exists in two versions, a 360KB (-001) and 1.2MB (-002) versions. The 360K external floppy can be used with either 5.25" diskette adapters. The 1.2MB external floppy drive is limited to the 1.2MB version of the 5.25" external floppy adapter
The 4869-xx1 has an embossed "Star" symbol in the faceplate of the drive.
If you look at the underside you will find 4869-xxx, where
The external diskette drive (4869-002) and the internal diskette drive (6451006) do not operate as the "B" drive unlike the current Personal System/2 5.25-inch External Diskette Drive (4869-001), This frees up the "B" slot so that it can be used for other features (refer to Product Announcement 188-148, dated September 13, 1988). When the system is configured for the 5.25-inch diskette drive, the drive is assigned the next available drive letter. For example, if the using system has diskette drive "A" and fixed disk drive "C", then the 5.25-inch diskette drive will be assigned as the "D" drive.