You can use Powershell to get the block size of a Windows NTFS volume:
On newer systems:
Get-CimInstance -ClassName Win32_Volume | Select DriveLetter,Label, BlockSize | FT -AutoSize
On older systems, the Get-CimInstance may not be available, in which case you can use the (deprecated) Get-WmiObject:
Get-WmiObject -Class Win32_Volume | Select DriveLetter,Label, BlockSize | FT -AutoSize
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