Hello jaclaz, 1st of all, Thank you very much for your really nice reply. I appreciate it. Here is what happened:- Like I told you I divided the 1000Gb hard into 4 partitions."300 ,300,200,and 150" I used the instruction of testdisk u gave me. I was ale to reactivate only the 1st partition,access it and see the data intact in it. Then when I tried to reactivate the second partition--->This caused the space before this second volume to be read "unallocated" and the space after it became unallocated too. plus none of the partitions on this hard became readable. I was able to back up the data on the 1st partition,the only thing I want now is to get the data from the second partition,and then format the hard,the 3rd and 4th partitions are not important to me. BTW The test disk runs very slowly although I have a "2.4 Quad processor 8mb cach,and 4Gb Ram" I know I became such a burden but please bear with me,and Your advice is really appreciated. And please if anybody else had any ideas,to help me with my situation,I'd be really grateful.