qCVF

                             CVF
                   Compressed Volume File
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A CVF is a file with a name such as DBLSPACE.000 or
DBLSPACE.001; it contains all of the files and file-system
bookkeeping information for a DoubleSpace compressed disk.
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Before a CVF can be accessed as a disk, it must be mounted;
that is, the DoubleSpace support must recognize it and assign
it a drive letter.
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■ TECH Help! describes the layout of CVFs in detail.
  See DoubleSpace and CVF Layout in the Index.