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I'm trying to create a partition of 20GB size exFAT filesystem, but no partitioning software allows me (even Windows Disk Management). With 40GB it allows me, so I presume there is a minimum size for an exFAT partition. Somebody can reference any documentation explaining more about this?

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  • Just now I successfully format 1MiB (1048576 bytes) partition into exFAT file system using build-in diskpart and format command line utilities.
    – user364455
    Aug 14, 2016 at 21:32

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On Windows 10, there was no problem formatting a 16 GB flash drive as exFAT. Admittedly, this is not a direct answer to your question, but at least it narrows the issue to either HDD vs. flash USB drive, or perhaps Windows version (which you did not state).

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You might try to format using another version of Windows. exFAT is an MS proprietary format, so third-party tools might not work as well. Have you tried the tools at AlternativeTo?

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  • "Admittedly, this is not a direct answer to your question" Then why have you not posted it as a comment?
    – Xavierjazz
    Aug 14, 2016 at 20:36
  • I'm using a SSD drive which has GPT partition table and already has partitions on it. Using Windows 10.
    – Smeterlink
    Aug 14, 2016 at 20:56
  • @ Xavierjazz, Can't put an image in a comment.
    – DrMoishe Pippik
    Aug 15, 2016 at 0:21
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Using the mkexfatfs utility on (Arch)Linux I can format a 84 KiB (86,016 bytes) partition with exFAT, but for 83 KiB (84,992 bytes) the utility errors out (ERROR: too small device (83 KB)).

On Windows I can't go below 1 MiB, because diskpart seems to only accept size arguments in MiB.

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