FAT32_MASK
#define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK)
case FAT32_MASK:
readcn &= ~FAT32_MASK;
readcn |= newcontents & FAT32_MASK;
case FAT32_MASK:
case FAT32_MASK:
(MSDOSFSFREE & FAT32_MASK) | (cluster & ~FAT32_MASK));
fatVolume->pm_fatmask = FAT32_MASK;
dummyVolume.pm_fatmask = FAT32_MASK;