pm_ResSectors
pmp->pm_ResSectors = getushort(b50->bpbResSectors);
pmp->pm_ResSectors *= BlkPerSec;
pmp->pm_fatblk = pmp->pm_ResSectors;
pmp->pm_ResSectors = getushort(b50->bpbResSectors);
__func__, pmp->pm_BytesPerSec, pmp->pm_ResSectors, pmp->pm_FATs,
pmp->pm_ResSectors *= tmp;
pmp->pm_fatblk = pmp->pm_ResSectors;