I'm looking at upgrading both my internal and external HDD drives to add some storage. Both Seagate and WD 2TB models. I've been seeing mixed reviews of the Seagate models (both internal and external)... They're primarily positive. But the XHDs seem to have issues with cooling, and both issues with failure / not being recognized. Wondering if anyone here has used these two models and can offer some insight? Normally, $20-$40 per drive cost difference wouldn't be an issue, but it adds up when buying multiple drives. Any help would be greatly appreciated!