When configuring disks for specific performance, especially in SQL and Exchange, it is important to set NTFS disk allocation unit size correctly. Foe example, The size of files and IO operations call for 64K unit size
run the following command from an elevated command prompt:
fsutil fsinfo ntfsinfo <Disk Letter:>
Bytes per Cluster shows the allocation unit size. Divide by 1024 for KB.
Posted by the original author via Tritone Consultants