Windows 10: How can I know the cluster size for an exFAT hard drive?

Discus and support How can I know the cluster size for an exFAT hard drive? in Windows 10 Support to solve the problem; I couldn't find a way to learn what's the cluster size (allocation unit size) for an exFAT partition (or any other format). I tried with HWinfo,... Discussion in 'Windows 10 Support' started by antonio3535, Jun 9, 2020.

  1. How can I know the cluster size for an exFAT hard drive?


    I couldn't find a way to learn what's the cluster size (allocation unit size) for an exFAT partition (or any other format). I tried with HWinfo, Windows msinfo32, Hard drive sentinel, DriveDX. None of them say it!

    Any help much welcome.

    - - - Updated - - -

    Just right click on the drive you want to find cluster size click format (DO NOT CLICK OK AFTER THAT) the last format cluster size will be displayed!

    :)
     
    antonio3535, Jun 9, 2020
    #1
  2. woojoo666 Win User

    Check the cluster size of an exFAT drive on Windows

    How do I check the cluster/allocation size of an exFAT drive on Windows?
     
    woojoo666, Jun 9, 2020
    #2
  3. lx07 Win User
    Hard drive cluster size issues? Size on HDD over twice the actual size


    For the a sector size of 4k to double your disk utilization you'd have to have a really tiny average file size. From your numbers shown the average size if I calculate it correct is 132kb (unless you have 1 massive file and 17,711 tiny ones) so a 4k size will make no difference.

    You could check with TreeSize Free - it will tell you if you right click on the status bar and select it to be displayed.


    How can I know the cluster size for an exFAT hard drive? [​IMG]


    EDIT - having checked the default for ExFat is 128k for drives over 32GB (https://support.microsoft.com/en-us/kb/140365) and when I tried to format an external USB drive that is what it picked. According to macbook - Reformat exFat with specific Device Block Size and Cluster Size - Ask Different OSX picks 128k also.

    So if you had 128k as your cluster size minimum disk utilization would be 17,772 files * 128k = 2.17GB. So if all your files were just over this (say 132k which looks like your current average size) you would be using 4.44GB add a couple of big files and it could easily be 6GB.

    I would check your average file sizes and also your current cluster size (you can use chkdsk as described in the AskDifferent link above).

    The default is 4k for NTFS and I have always formatted ExFat as 4k also. Depending on your current setting reformatting 4k looks like a good idea.

    As for how - copying the data elsewhere, formatting and then copying it back has to be the easiest, safest and most likely fastest way. You'll also get the disk defragmented automatically. There are tools to do it but they seem to have limitations and I wouldn't bother if you have a spare disk.
     
    lx07, Jun 9, 2020
    #3
  4. How can I know the cluster size for an exFAT hard drive?

    file system cluster size

    Hi

    Can someone explain to me what is minimum and maximum cluster size for FAT/FAT32 and exFAT file system?
     
    Mohammad Sadegh Ghorbani, Jun 9, 2020
    #4
Thema:

How can I know the cluster size for an exFAT hard drive?

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