create an exFAT file system


Create an exfat filesystem inside partition 1 on device b (sdb1)

$ mkfs.exfat [/dev/sdb1]

Create filesystem with a volume-name

$ mkfs.exfat -n [volume_name] [/dev/sdb1]

Create filesystem with a volume-id

$ mkfs.exfat -i [volume_id] [/dev/sdb1]


mkexfatfs [ -i volume-id ] [ -n volume-name ] [ -p partition-first-sec‐ tor ] [ -s sectors-per-cluster ] [ -V ] device


mkexfatfs creates an exFAT file system on a block device. device is a special file corresponding to the partition on the device. Note that if this is an MBR partition then the file system type should be set to 0x07 (NTFS/exFAT) otherwise other operating systems may refuse to mount the file system.


Command line options available: -i volume-id A 32-bit hexadecimal number. By default a value based on current time is set. -n volume-name Volume name (label), up to 15 characters. By default no label is set. -p partition-first-sector First sector of the partition starting from the beginning of the whole disk. exFAT super block has a field for this value but in fact it's optional and does not affect anything. Default is 0. -s sectors-per-cluster Number of physical sectors per cluster (cluster is an allocation unit in exFAT). Must be a power of 2, i.e. 1, 2, 4, 8, etc. Cluster size can not exceed 32 MB. Default cluster sizes are: 4 KB if volume size is less than 256 MB, 32 KB if volume size is from 256 MB to 32 GB, 128 KB if volume size is 32 GB or larger. -V Print version and copyright.


Zero is returned on successful creation. Any other code means an error.


mkfs(8) fdisk(8) January 2014 MKEXFATFS(8)


Andrew Nayenko

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