Solid in synology rs814 network server!
I purchased two of these 4 tb drives in february of 2014 to use in my synology rs814 network server that i use in my home network, and they have been in continuous use since then. I have seen from other reviews where some people have received refurbished drives (some knowingly, and some un-knowingly), so i made sure everything is on the up and up and i checked the wd warranty check web site, and the warranty on both drives expires on 3/26/2019.(for the life of me i cannot understand why anyone would knowingly purchase a "refurbished" hard disk drive.)back when i ordered these, they were sold directly by outletpc. When possible, i buy from outletpc, or at least from sellers who use outletpc for their fulfillment services.My rs814 is configured to never spin down the drives, so they are constantly running. As well, the rs814 is powered from a ups.The two drives are in a raid 1 configuration in slots 1 and 2 of the 4 drive rack mount server. I have another 4 tb drive in slot 3 that is the backup drive for the raid volume, and use synology "time backup" which makes hourly backups and works pretty much like apple's time machine. Recently the seagate drive i was using for the backups failed (it was an older drive i had on hand when i installed the synology server) with about 22,000 hours on it and i have replaced it with a less expensive 4 tb wd red that i had on hand.Update august 5, 2016:drives are still going strong with 21,305 hours on them.