How to check allocation unit size


The best way, and the right tool for the job is fsutil. In command line just type;

fsutil fsinfo ntfsinfo <drive>:

Examplae: fsutil fsinfo ntfsinfo c:

Output:

C:\>fsutil fsinfo ntfsinfo e:
NTFS Volume Serial Number : 0x0e6640c86640b1ef
Version : 3.1
Number Sectors : 0x0000000018ffe2fb
Total Clusters : 0x000000000031ffc5
Free Clusters : 0x0000000000059043
Total Reserved : 0x0000000000000000
Bytes Per Sector : 512
Bytes Per Cluster : 65536
Bytes Per FileRecord Segment : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length : 0x0000000000280000
Mft Start Lcn : 0x000000000000c000
Mft2 Start Lcn : 0x000000000018ffe2
Mft Zone Start : 0x00000000002e88c0
Mft Zone End : 0x0000000000307ea0

🙂

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