/A:size Overrides the default allocation unit size. Default settings are strongly recommended for general use. NTFS supports ...

/A:size         Overrides the default allocation unit size. Default settings                    are strongly recommended for general use.                    NTFS supports 512, 1024, 2048, 4096, 8192, 16K, 32K, 64K.                    FAT supports 512, 1024, 2048, 4096, 8192, 16K, 32K, 64K,                    (128K, 256K for sector size > 512 bytes).                    FAT32 supports 512, 1024, 2048, 4096, 8192, 16K, 32K, 64K,                    (128K, 256K for sector size > 512 bytes).                      Note that the FAT and FAT32 files systems impose the                    following restrictions on the number of clusters on a volume:                      FAT: Number of clusters <= 65526                    FAT32: 65526 < Number of clusters < 4177918                      Format will immediately stop processing if it decides that                    the above requirements cannot be met using the specified                    cluster size.                      NTFS compression is not supported for allocation unit sizes                    above 4096.      /F:size         Specifies the size of the floppy disk to format (1.44)
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