Chris M wrote: 2.5" drives are more modern than damn near any "legacy machine" :> I'd like to remove the 3.5" drive in my Portable 3 and add a second floppy (since floppies on the Portable 3 seem to be flakey given its age). I would then like to squeeze a *2.5"* drive in amongst the works and end up with dual floppies AND a hard disk. Older BIOS's and disks often didn't like it when the disk didn;t agree with it's notion of drive geometry. Newer drives use translation algorithms so that internally they can think of themselves as "just a bunch of sectors". And, have variable geometries to best utilize the surface area and effective head velocity over that media (media at the periphery of the drive "moves faster" than at the hub). I've found it easier to just force the BIOS and drive to agree on a geometry than to leave that as an "unknown" Because the machine in question already has a 3.5" IDE drive in it that is working fine (16 bit interface)