To use e-disk demo version just try to enter the serial number 3 times (type in whatever you feel like, or just click OK three times) and the copy will turn into the demo version. Then if you feel like purchasing it, you can use the register by phone button on the screen which will come up each time you start it up.
This will expand your disk only by a factor of 1.5 as apposed to 2,3, or 4 times as in the real version 1.2.
For more information on how driver-level compression works or how it compares to other compression schemes, see the text files in the info-mac directory (info-mac/comp) on this subject (driver-level-comp.text, etc.) or the August 1993 MacWorld for an explanation on how driver level compression differs from file-level compressors like Autodoubler™.
If it doesn't work, or you have questions you can e-mail me at sartain@staff.tc.umn.edu is you feel the need.
You have to reformat your drive to install it, but it is easily removed once you are using it. The best way to see if it is for you is to try it. My tests showed that it greatly speeds up disk reads, while it slow down the writing some. But don't take my word for it, try the demo!
