Hello! Need some advice...tried on the Apple DB but got no help. Anyway I'm trying to replace my original HD in my mid 2010 MBP. I'm still running 10.6.8 but want to update to El Capitan once the new HD is in. After reading and reading and reading, I've currently got the NEW Seagate 1tb hybrid drive (has a small SSD built in) hooked up via USB to zero it out, then will reformat the drive before cloning my old internal HD to it using Disk Utility. Is it really necessary to write the zeros first? It's a 1tb drive which will take at this point SEVEN hours....on an empty, brand new hard drive! I do not have my install disks and the local Apple Store is as useless as tits on a nun... Please, help me out! I miss my camera, Photoshop and Lightroom. My old drive whistles and I get the beachball all the time....plus it's about full. Thanks in advance!!