I can't see or access my second hard drive. Although it is shown at the start-up screen and also at the disk management window.
It is shown as an unallocated area and i can't initialize it or do anything to it However i can't and i don't want to format this hard drive because it contains a very important data for me
( when i try to initialize the HDD through the disk management it keeps showing an error saying " the request could not be performed because of an I/O device error" )
operating system: Windows 7 pro 64x bit
first hard drive: 1T Western Digital
second hard drive: 1T Western Digital - one partition only
If data recovery software can't find it, the only way to make it seen is to initialize it through disk management. You said you already tried it, so the drive may be beyond repair. I'd try a few more recovery software before giving up.