Get the default cluster size for NTFS

Question

I try to determine the default cluster size for NTFS. I check this table.

The problem is when the size in the boundary, for example:

2 TB–16 TB: 4kb 16TB–32 TB: 8kb

Then what will be the cluster size for 16TB? It is difficult to find a disk that exactly match the size boundary to make the test.

Answer 1

From Microsoft NTFS Overview

With (2^32 – 1) clusters (the maximum number of clusters that NTFS supports), the following volume and file sizes are supported.

That means a maximum of 4,294,967,295 4kB clusters for a total of 17,179,869,180kB (16TB - 4kB) of data.

The "boundary" you are looking for is, quite literally, 16TB. Below 16TB will have 4kB clusters while 16TB and above will have 8kB clusters.

Above that partition size NTFS would switch to 8KB clusters.

Answer 2

the answer is to use a simple command line with powershell

Get-CimInstance -ClassName Win32_Volume | Select-Object -Property Name, Label, BlockSize

The blockSize is in Bytes