Hey guys yesterday i tested my hdd with one program called Hard disk sentinel pro and the results was that i have 18 days live left on my hdd and alot of bad sectors and i checked the hdd with the windows default program and the results ware 0 bad sectors , so can i trust the sentinel pro or not and my other issue is im thinking of buying another hdd, but my current one is hitachi 32 mb cache and im thinking to get wd black 64 mb cache is it okay to have different hdd caches linked together in my pc ? Thank you !