How do I check the cluster/allocation size of an exFAT drive on Windows?
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You can use wmic
C:\>wmic volume get driveletter,blocksize BlockSize DriveLetter 4096 D: 4096 C:
On powershell you'll have various solutions like below
PS C:\> (Get-Volume C).AllocationUnitSize
4096
PS C:\> (Get-WmiObject win32_volume | where { $_.driveletter -eq 'C:' }).BlockSize
4096
Alternatively you can also run fsutil fsinfo ntfsinfo drive: as admin to get more detailed information, or use fsutil fsinfo ntfsinfo <drive> | findstr /c:"Bytes Per Cluster" to get just the cluster size
phuclv
- 27,773
2
Right-click the drive and click "format", and the pop-up window will show the current cluster size under "allocation unit size". Be careful that you don't actually format the disk though!
woojoo666
- 345
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This is not always accurate. I formatted exFat 4096 (CMD format windows 10) and not only Format window does not present the option, it shows wrongly an 128kb size. No way – Thanasis Dec 10 '23 at 15:13
fsutilonly works for NTFS drives, butwmicworked, and wasn't as risky as my solution. Thanks! – woojoo666 Sep 16 '18 at 10:34