It's been a week since my friend locked his whole data within his HD(SAMSUNG SP0842N) by misuse of a Master ATA Password featured in "ATAPWD" tool.
Since his data is not encrypted there is hope to do something by only removal of the PW.
We've been searching the net and the only solutions available seems to be Hardware ones, except this one:
That is an online service only supporting certain drives.
and This is an example of Hardwares we may use to unlock the HD:
I think now you are agree with me not to buy a hardware while there may be software solutions hidden somewhere.
Software solutions are somehow related to modifying Framework Section located on the disks.