Hi ultimax,
Firstplace Is the data important or not ??
*If you are sure you did n't write any data into your external drive,then possibilities are very high your data can be recovered.
*Reg your question to buy a software they will cost you anywhere from $100 - $500.
*But I doubt one cant put/purchase the knowledge needed to do the data recovery for sale

... learn instantly and start recovering data ...
*I guess you are not a DR Pro who does DR everyday.
*PM me your email and hardisk details :
number of Partitions
filesystem used
List of very important files that you want to recover
I will help you to recover your data ...
Cheers,