Why does compressing and decompressing my SSD hard drive free up space?

Posted by Paperflyer on Super User See other posts from Super User or by Paperflyer
Published on 2011-09-05T08:03:20Z Indexed on 2012/10/10 15:41 UTC
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Filed under:

windows-7

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Windows

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ssd

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compression

I bought an SSD (SandForce 2), created a tiny 25GB partition on it for Windows and installed Windows 7 64-bit. In order to free disk space, I enabled compression on the drive using the Properties entry in the context menu for the drive in Explorer.

Prior to compressing I had around 5GB of free space. After compression I had 4GB, so compression was not working for me. I figured this might have happened because of the built-in data compression of the SSD.

I decompressed the files again - after decompression, it left me with 7GB of free space! Better yet, after restarting, I had 10GB. What is happening here?

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