Micro Peipherals model B51 FDDs

First of all, there never were ANY 5-1/4" drives of any sort I've ever encountered, that were SD, that's because the drive doesn't determine the rlux reversal density with which the controller writes on the media, and because the head technology, by the time 5-1/4" drives came into common usage, would always support "double density" which relies on a more efficient modulation technique than what's used in SD. Secondly, if you look at the drive, you should be able to tell whether there are two heads or just one from the cable connectors. On some drives you may have to look where the cables come from by dismounting the board and looking underneath, but these are often shielded cables with thin (#28 or smaller) insulated wires in a common shield, coming from the heads. One such cable will dome from each side of the head assembly. MPI drives were used in the original IBM PC's, so they might look the same as what you see in the old PC's at the junk shops. There is nothing strange about any of the MPI drives, so, unless you have an OEM version of one sort or another, you may safely assume the obvious. Dick ----- Original Message ----- From: Wayne M. Smith <wmsmith(a)earthlink.net> To: <classiccmp(a)classiccmp.org> Sent: Saturday, October 21, 2000 9:21 PM Subject: Micro Peipherals model B51 FDDs