It's recommended that you have 6 megabytes of disk space available for storing incoming faxes and files. This is enough space for approximately 30 pages of faxes (at 200 kilobytes per page).
If you have less than 6 megabytes on the specified drive, select another drive with more space. If you have no other drive (or none with the recommended space), after installation delete files you no longer need to make more space for faxes.
NOTE: If you are installing FAXability over a previous version, you will have more space available than was just displayed. The space-available number doesn't take into account that you will be replacing files rather than adding them.