Query NTFS Blocksize

Using 64k blocksize for better performance

Partitions with Veeam-Backups, SQL-Database files or SQL-Logs should be formatted with a 64k blocksize for better performance. You can check blocksizes with a simple command.

Open a CMD Shell with Administrator rights.

fsutil fsinfo ntfsinfo <Drive>

Example for the system partition.

fsutil fsinfo ntfsinfo C:
NTFS-Volumeseriennummer : 0xa892e42c92e400a4
Version : 3.1
Anzahl der Sektoren : 0x000000001dc807ff
Gesamtzahl Cluster : 0x0000000003b900ff
Freie Cluster : 0x0000000000b42c71
Insgesamt reserviert : 0x0000000000000ff0
Bytes pro Sektor : 512
Bytes pro physischen Sektor : 512
Bytes pro Cluster : 4096
Bytes pro Dateidatensatzsegment : 1024
Cluster pro Dateidatensatzsegment : 0
MFT-gültige Datenlänge : 0x0000000017180000
MFT-Start-LCN : 0x00000000000c0000
MFT2-Start-LCN : 0x0000000000000002
MFT-Zonenstart : 0x0000000000eb7240
MFT-Zonenende : 0x0000000000eb9340
RM-Bezeichner: FFFF0956-A102-11E7-87BD-005056C00008

You can see Bytes per Cluster: 4096 which equals 4KB.


To check all local partitions for the corresponding blocksize you can use a PS script, which was originally posted by Stuart Moore.

$wql = "SELECT Label, Blocksize, Name FROM Win32_Volume WHERE FileSystem='NTFS'"
Get-WmiObject -Query $wql -ComputerName '.' | Select-Object Label, Blocksize, Name


Stuart Moore – Get Cluster size for all disks and volumes on a Windows machine using powershell and wmi

Veeam Backup & Replication Best Practices

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