pm_Sectors
pmp->pm_Sectors = getushort(b50->bpbSectors);
if (pmp->pm_Sectors == 0) {
pmp->pm_HugeSectors = pmp->pm_Sectors;
pmp->pm_Sectors = getushort(b50->bpbSectors);
pmp->pm_FATs, pmp->pm_RootDirEnts, pmp->pm_Sectors,
if (pmp->pm_Sectors == 0) {
pmp->pm_HugeSectors = pmp->pm_Sectors;
if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) {
pmp->pm_Sectors, pmp->pm_FATsecs, vers));