program to undelete an acronis tib file

[rafirafi]

Hi,
I regularly backup my HD to external drive.
Of course, the last backup failed and my disk crashed.
Before doing backup (with acronis) i do a quick format to the external drive.
To my understanding, the previous backup (a 600 giga acronis tib file) should be present on the disk but none of the programs i have used detected it.
any suggestions for a recovery program to detect this kind of files?

Thanks in advanced,
Rafi.

[MindMergepk]

R-studio has an option to create user defined file type.
read here...
http://www.r-tt.com/Articles/Creating_C ... _R-Studio/