/C Creates an NTFS volume that the system compresses by default. Consequently, you won??™t
need to perform this step separately later.
/X Forces the system to dismount the drive before formatting if necessary. Dismounting the
drive closes all open handles.
/A:size Overrides the default allocation unit size for the hard drive. You can use this feature
to optimize storage for specific tasks. For example, if you plan to store many small files, you
might want to use a small allocation size. The size argument can include 512 bytes, 1,024 bytes,
2,048 bytes, 4,096 bytes, 8,192 bytes, 16 KB, 32 KB, and 64 KB cluster sizes for NTFS drives. You
can??™t use compression on NTFS drives with a cluster size larger than 4,096. A FAT- or FAT32-
formatted drive can use cluster sizes of 512 bytes, 1,024 bytes, 2,048 bytes, 4,096 bytes, 8,192 bytes,
16 KB, 32 KB, 64 KB, 128 KB, and 256 KB. You can only use the 128 KB and 256 KB options for a
sector size greater than 512 bytes.
NOTE FAT and FAT32 file systems impose a limit on the number of clusters per volume. A FATformatted
drive can have 65,526 or fewer clusters. A FAT32-formatted drive can have any number
of clusters between 65,526 and 4,177,918.
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