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I was copying large files over to my computer for video editing and keeping an eye on available hard drive space I knew I should have had just enough space to put everything. However, as I was getting close to filling up my hard drive, the available free space suddenly jumped by about 30GB. Any idea what happened?

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up vote 4 down vote accepted

This can happen with Transactional NTFS. The free space is used for storing the transaction, once the transaction is committed the free space can be reclaimed.

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The OS automatically emptied your trash, deleted TMP files, etc....

Happens on Windows and OS X.

What is your OS?

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Windows 7. I emptied my trash earlier already and actually had to uninstall a few programs and clean up the computer a little before i transfered files to my computer. I didn't do anything with the temp files but can temp files really add up to 30GB? – Faken Jun 8 '10 at 2:55
    
The other thing that can happen is a delayed recognition by the OS of additional space... – drewk Jun 8 '10 at 3:06

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