-/ required for floppy disk (512/1024) and optical disk (512/2048).
-/ When _MAX_SS is larger than 512, GET_SECTOR_SIZE command must be implememted
-/ to the disk_ioctl function. */
+/ required for on-board flash memory, floppy disk and optical disk.
+/ When _MAX_SS is larger than 512, it configures FatFs to variable sector size
+/ and GET_SECTOR_SIZE command must be implememted to the disk_ioctl function. */
+
+
+#define _MULTI_PARTITION 0 /* 0:Single partition, 1/2:Enable multiple partition */
+/* When set to 0, each volume is bound to the same physical drive number and
+/ it can mount only first primaly partition. When it is set to 1, each volume
+/ is tied to the partitions listed in VolToPart[]. */