Thursday, October 22, 2009

What’s my NTFS Cluster Size?

Maybe you’re a SQL Server DBA and you prefer 64K cluster sizes for optimizing disk I/O to read an extent at a time, or you just need to know how a volume was formatted.  The command line can help using fsutil:

fsutil fsinfo ntfsinfo c:  

Sample output:


“Bytes per cluster” shows the cluster size in use on the volume letter specified – in this case, 65536 bytes, or 64KB.

Cue Dora the Explorer “We Did It” music.


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