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Blocksize missing?

Posted by: | April 28, 2015 Comments Off on Blocksize missing? |

I recently had a question asking why the Bloacksize property on Win32_LogicalDisk is empty but is populated on Win32_Volume.

The thing is to remember the underlying thing that these 2 CIM classes represent.


A logical disk is a subdivision of an extended partition. An extended partition can hold one or more logical disks.


When you create a volume on a disk you use either a primary partition or a logical disk from an extended partition. Until you format the volume you can’t have a block size as that is determined by the parameters you use to perform the format.


The documentation for Win32_LogicalDisk states that block size is not populated for logical disks https://msdn.microsoft.com/en-us/library/aa394173(v=vs.85).aspx.

under: CIM, File System

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