OneDrive disk space and file size don't match

You may see a difference between Size and Size on Disk when viewing file, folder or drive properties. This could be because of the following reasons:

  1. The OneDrive Files On Demand feature doesn't download the file to your computer, only a placeholder or link to it.

  2. Storage utilities show file categories, not the actual files.

For more information, expand the sections below:

OneDrive Files On Demand doesn't download all the files to your computer, only a placeholder or link to it.

OneDrive Size on disk properties

For more information, read about Files On-Demand for Windows 10 or Files On-Demand for Mac.

The macOS Disk Utility and other apps display storage categories. In their support article, Apple say: 

"Don't rely on these categories to understand how much storage space is available for your data. 

"The Storage pane of About This Mac is the best way to determine the amount of storage space available on your Mac."

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For help with your Microsoft account and subscriptions, visit Account & Billing Help.

For technical support, go to Contact Microsoft Support, enter your problem and select Get Help. If you still need help, select Contact Support to be routed to the best support option.

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Admins should view Help for OneDrive Admins, the OneDrive Tech Community or contact Microsoft 365 for business support.

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