pm_SecPerTrack
pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
pmp->pm_FATsecs, pmp->pm_SecPerTrack, pmp->pm_Heads,
|| pmp->pm_SecPerTrack > 63) {
SecPerClust, pmp->pm_SecPerTrack));