Using Windows 7 64 bit. I'm about to buy a Western Digital 2TB SATA 64 MB Cache hard drive, or a Western Digital 2TB 32 MB Cache. They're around the same price. But I'm unsure what the difference is between 64 or 32 MB cache, downsides, upsides, if any. What I want to avoid most of all is difficulty in installation. Any tips appreciated.