I have some RE4’s. Data Lifeguard Diagnostic for DOS does not work, so I installed Data Lifeguard Diagnostic for Windows on a Windows 7 machine. With the Intel RST driver, I got the “Too many bad sectors detected” message, which was strange because these are new drives. I did a clean install of the OS and left the Microsoft AHCI driver in place, after which DLG Diag for Win passed the drives.
Also, in power options I had to set both turn HD off and sleep to “Never”, otherwise DLG Diag for Win (Extended Test, Write Zeros) will pause every time the machine sleeps.