pm_HiddenSects
pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);