drives is an "insufficient statistical sample to give any measure of an accurate analysis of "X" product" Statistics say that you don't have to be a rookie to observe a good working product. Seems that the motors to spin up so many large multiple platters is one big problem with them out of many.that and 'sticking too many eggs in one failure basket' ? Id warn others that want the big drives to consider against it. The 4TB have a nasty failure rate.the WD 4TB almost border on the "lemon" range. one a 4TB and one a 8TB - one of the drives on the 4TB is failing Most storage experts agree on the Hitachi 2.5" HGST Touro Mobile 1TB USB 3.0 External Hard Drive *This one is the BEST external HD available that money can buy: Quality 1TB drives are $50 per TB on 3.5" or $65 per TB on 2.5" Here are "best for the money".at bottom is BEST external USB HDÄ«est options for the price, and high quality HD: Toshiba is nearly neck and neck in 2.5" USB external HD to Hitachi. This is basically the ONLY thing the "HD gurus" agree on.