Viewing Allocation Unit Size of a NTFS Disk

-> Open an “Administrator – Windows Powershell ISE”.

-> Execute below command,

fsutil fsinfo ntfsinfo C:

-> Output below,


-> “Bytes per Cluster” provides us the Allocation unit size. In my case it is 4 KB.

Thank You,
Vivek Janakiraman

The views expressed on this blog are mine alone and do not reflect the views of my company or anyone else. All postings on this blog are provided “AS IS” with no warranties, and confers no rights


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