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Is there a Windows 7 native way to display the overall compression ratio on a Windows compressed drive?

As part of our disaster recovery process, we're copying some key system folders onto 2TB external hard drive, encrypted using TrueCrypt and copied using robocopy. The drive is compressed and I'd like to see what kind of compression ratio we're getting and whether it's actually worth the performance overhead.

I know that TreeSize can possibly do this (as mentioned in another post) but want a OS native way if possible.

Thanks, Rob.

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The compact command is a native Windows command that displays or alters the compression state of files and directories.

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