FAT12_MASK
#define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK)
case FAT12_MASK:
case FAT12_MASK:
case FAT12_MASK:
if (pmp->pm_maxcluster < (CLUST_RSRVD & FAT12_MASK)) {
pmp->pm_fatmask = FAT12_MASK;
case FAT12_MASK:
case FAT12_MASK:
case FAT12_MASK:
<= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
pmp->pm_fatmask = FAT12_MASK;