Wipe out return defective hard drive?

Should I wipe out ie reformat the defective hard drive first when I send the it back to WD? Or do they need to have everything in to diagnose what happen to the drive? The instructions just said backing up the data. I just do not feel confomtable if I send the drive with everything eg program, data etc in it.

Please help. Thanks.

Hi yes go ahead and format the drive they dont need your stuff and would wipe the drive when they got it anyway.

Thanks a lot. I will format it before I send it out.