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The system is telling me I am out of space on my compressed disk even though I should still have space left
Explanation: The system said I had a certain amount of space free on my compressed volume but when I tried to copy an amount of files that should have fit, the disk ran out of space before copying all the files.
Diagnosis: It is impossible to know exactly how much free space there is on a compressed volume. The reason is that the amount you can store on the volume depends on how much its contents can be compressed, but the system doesn't know what the right ratio is until after the files have been copied. Therefore, the compression driver only estimates the amount of free space on the drive. If you copy a bunch of files to the volume that don't compress very much, you will use up a disproportionate amount of the free space. This is discussed in much more detail here, including an example.