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I have a 2 TB NAS, Drive M, connected to my PC. If I right click on M, under Properties it shows:

Used space 530GB Free space 1.26TB.

But, if I right click the individual sub folders they show:

Size: 350GB Size on disk: 2.38TB

Size: 141GB Size on disk: 252GB

Size: 36GB Size on disk: 100GB

This gives a total of 2.73TB. How is this possible?

Allan
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1 Answers1

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Most likely, Windows does not calculate the size on disk correctly. As author of the tool TreeSize I know that this can be difficult. Possible reasons might be hardlinks or a kind of sub-block deduplication which the NAS does internally. Both is difficult to track for disk space usage software, especially the deduplication. Both leads to blocks of the disk being used for multiple files.

Often TreeSize provides more reliable results. You may consider using the fully functional 30 day trial of TreeSize Personal, switch TreeSize to the mode "Allocated Space", or even better enable the new "Details" tab and post a screenshot.

Community
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Joachim Marder
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