Check the cluster size of an exFAT drive on Windows

How do I check the cluster/allocation size of an exFAT drive on Windows?

2 Answers

You can use wmic

C:\>wmic volume get driveletter,blocksizeBlockSize DriveLetter
4096 D:
4096 C:

On powershell you'll have various solutions like below

PS C:\> (Get-Volume C).AllocationUnitSize4096PS C:\> (Get-WmiObject win32_volume | where { $_.driveletter -eq 'C:' }).BlockSize4096

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

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!