How to Check Disk Allocation Unit Size on windows servers

To check disk allocation unit size in windows servers
Windows 2003:
  1. Goto command prompt
  2. type, fsutil fsinfo ntfsinfo d:
d: - is the drive letter.

C:\>fsutil fsinfo ntfsinfo d:
NTFS Volume Serial Number :       0xd6ea1663ea164063
Version :                         3.1
Number Sectors :                  0x000000001dffefff
Total Clusters :                  0x00000000003bffdf
Free Clusters  :                  0x000000000028d359
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 :           0x0000000000080000
Mft Start Lcn  :                  0x000000000000c000
Mft2 Start Lcn :                  0x0000000000000001
Mft Zone Start :                  0x000000000000c000
Mft Zone End   :                  0x000000000000cca0
RM Identifier:        3388638F-9D21-11E2-9B41-005056A8090B

‘Bytes per cluster’ shows the allocation unit size.

Windows 2008:
Above fsutil command works in windows 2008, still you can check with diskpart command also.

1. Goto command prompt
2. type, diskpart and select the volume

DISKPART> select volume 2
Volume 2 is the selected volume.
DISKPART> filesystems
Current File System
  Type                 : NTFS
  Allocation Unit Size : 64K
  Flags : 00000000
File Systems Supported for Formatting
  Type                 : NTFS (Default)
 Allocation Unit Sizes: 512, 1024, 2048, 4096, 8192, 16K, 32K, 64K (Default)



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8 comments:

  1. UnknownApril 25, 2014 at 9:02 PM

    it helped me today. there was client requirement to check the disk allocation unit size and yhis helped me to find it.

    ReplyDelete
  2. AnonymousMay 1, 2014 at 8:45 PM

    this is the best way to find it if you have several drives and especially in a windows cluster. Thanks a lot

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