 If this sector is present on a FAT32 volume, the minimum allowed logical sector size is 512 bytes, whereas otherwise it would be 128 bytes.Some FAT32 implementations support a slight variation of Microsoft's specification by making the FS information sector optional by specifying a value of 0xFFFF (or 0x0000) in the entry at offset 0x030.A volume's data area is divided up into identically sized "clusters", small blocks of contiguous space.