4869drve.exe PS/2 5.25" Disk
Adapter/Option 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-x01 has an embossed "Star" symbol in the faceplate of the drive.
If you look at the underside you will find
The external diskette
drive (4869-002) and the internal diskette drive
(6451006) do not operate as the "B" drive unlike the
current (360KB) 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.
It is normal for the 4869 external 5.25" diskette drive spindle motor to spin when the internal diskette drive is accessed on 8580 products. In fact, both spindle motors will spin when either drive is accessed. This also holds true if both drives are internal 3.5" diskette drives (three diskette drives are not supported on the system). Activating both spindle motors provides increased performance on multiple drive operations such as "DOS DISKCOPY", since motor start delays are eliminated when switching between drives. Operating both motors simultaneously will not affect device reliability.
makes sense for the bare 360KB floppy controller
adapter, as it is just a pass-through, and uses the
planar floppy disk controller. Don't know if this
applies to the 1.2MB Adapter/A. This may also apply to
other PS/2s that use the Drive
H037905 Intermittent 4869 Read