Seagate Desktop HDD.15 4TB / Barracuda XT 4TB review
 

The Desktop HDD.15 4TB is Seagate's official 4TB disk for use in desktop PCs. Unlike the 7200.14 disks, it runs at 5900 rpm, which means lower performance. The high data-density does make the Desktop HDD.15 4TB somewhat faster than most 5400/5900 rpm disks. Just like the 7200.14 disks, the Desktop HDD.15 contains 1TB platters, four of them in this case.

http://uk.hardware.info/reviews/4602...-xt-4tb-review