How can I determine the sector size in windows?

Solution 1:

You want fsutil. Make sure you run Command Prompt as Admin.

C:\Windows\system32>fsutil fsinfo ntfsinfo c:
NTFS Volume Serial Number :       0xf4ca5d7cca5d3c54
Version :                         3.1
Number Sectors :                  0x00000000378fd7ff
Total Clusters :                  0x0000000006f1faff
Free Clusters  :                  0x00000000000e8821
Total Reserved :                  0x0000000000000910
Bytes Per Sector  :               512
Bytes Per Physical Sector :       512
Bytes Per Cluster :               4096
Bytes Per FileRecord Segment    : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length :           0x00000000196c0000
Mft Start Lcn  :                  0x00000000000c0000
Mft2 Start Lcn :                  0x000000000097ffff
Mft Zone Start :                  0x000000000051f920
Mft Zone End   :                  0x000000000051f9a0
RM Identifier:        0652C3D3-7AA9-11DA-ACAC-C80AA9F2FF32

Solution 2:

Windows 10 update:

There is now a sectorInfo sub-command which may provide better information:

C:\>fsutil fsinfo sectorInfo C:

LogicalBytesPerSector :                                 512
PhysicalBytesPerSectorForAtomicity :                    4096
PhysicalBytesPerSectorForPerformance :                  4096
FileSystemEffectivePhysicalBytesPerSectorForAtomicity : 4096
Device Alignment :                                      Aligned (0x000)
Partition alignment on device :                         Aligned (0x000)
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