pm_HiddenSects
fatVolume->pm_HiddenSects *= fatVolume->pm_BlkPerSec;
volume->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
volume->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
volume->pm_HiddenSects = getulong(b710->bpbHiddenSecs);