On Mon, 14 Mar 2016, dwight wrote: > I don't recall how many heads a ST506 had. I have one on my NC4000, > home brew, machine. I recall picking the drives up at garage sales because > DOS no longer supported them, only being 5Meg. ftp://ftp.seagate.com/pub/techsuppt/mfm/st506.txt ftp://ftp.seagate.com/pub/techsuppt/mfm/st406.txt