I bought 8TB NAS. The disk is so slow in copying from and to. While transferring the drive goes offline and everything just stops there. The support is so worst that they ask you to do everything possible on earth, change wire, change electric ports, check for power loss, internet connectivity, router, different browsers, different computer and later they come out with lame reason. This is my worst ever tech purchase and I will never buy any hardware from WD from now on. More than the hardware the polite customer support suck.