With four terrabyte drives on my MacPro I am searching for a way to validate every bit on every drive. Steve Gibson's SpinRite utility will do this, but sadly Spinrite will not run on Intel/EFI (it uses the old BIOS to do the I/O).
What is the best way to accomplish the same job on the MacPro SATA drives?
I've run TechTool Deluxe, but I cannot find any documentation on what the "Surface Scan" test actually does. I'm 99% sure it only reads, probably once per block.