User`s guide

Drive Image Professional Chapter Seven - Software Utilities
101
10.(Optional) Type brief comments about your image file in the Image File
Comments field. Comments cannot exceed 300 characters.
11.Click Next. Select the desired compression level.
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No Compression is usually the fastest method for creating an image file
and is useful if storage space is not an issue. However, if you are saving
your image file to a busy network drive or to a relatively slow removable
media device, high compression may be faster than no compression since
there is less data to write to the file. Drive Image selects No Compression
by default.
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Low compression offers a 40% average compression ratio.
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High compression offers a 50% average compression ratio.