System Requirements:

 486 or Pentium-class processor IDE/SCSI hard drive 64MB RAM (128 MB recommended) Windows 98/Me/NT/2000/XP/2003, 100 MB of free space. Second hard disk is recommended for recovery.

Limitations:

This software is NOT able to find data on a physically damaged drive!

Not every file can be undeleted: less fragmentation (common if media not full) will increase the rate of recovery because the entire data is stored at the beginning of the first cluster of a file. The probability of recovery is lower, the smaller the disk capacity relative to the file size is.