Disk I/O error during Disk Initialization

One week ago..I had a dual boot of vista sp2 and win 7 on a WD hard disk.There was problem with one of my RAMs..but my technician was one stupid guy..he formatted the entire drive from XP Install CD.It became unaccessible from both Vista,XP,Win 7 Intsallations DVD..They said it OS cannot be installed on the disk as it was unaccessible.When I tried to initialize the disk for MBR formatting from Disk Management in Vista..It showed that the logical operation cannot be completed due to disk I/O error.I rescanned and restarted but the disk is still unallocated.
I used both Seagate and WD Diagnostic software..Both said SMART,Long DST,Short DST Long generic test...

What is the problem?Do I have to replace it?

 

First, as it's a WD HDD, you should only use the WD tools.

What does this mean "Both said SMART,Long DST,Short DST Long generic test..." ?

You can use the WD tools to partition and format the disk.