The description of the –w option has been updated to specify that directory contains compressed disk images rather than uncompressed disk images.
The updated –w option description is as follows:
Specify directory as the directory in which to compress files and create working data. By default, the ovmtcreate command uses the current working directory.
Using this option might cause problems if you run the command from the original location of disk files as they would need to be manually decompressed after creation. To avoid this problem, specify a directory other than the current working directory. Note that directory must have sufficient disk space to contain all of the compressed disk images and support files.