Using Defraggler v2.06.328 (64 bit ) on Windows 7 Home Premium
Defraggler worked well with 1.5 TB internal C-drive,but "analysis failed" with 3.0 TB external drive.
Both NTFS.
Windows Disk Degragmenter ran successfully on all drives.
Same problem for me. Defraggler worked on my old drives, but I just got a 3B drive, and now I get a "Failed to build file list" message.