Summary: The disk is perfect and stated new. However, my Readynas showed the power on hours for > 40,000. Strange ! Anyway, it was a good buy for only US$42 each. I bought 5 to replace all my old disks in the Readynas Net server.
Summary: I got these hard drives because my 2 TB drives were not working well with my external hard drive back up software. I figured out that the byte sector size was the problem with the Seagate Backup Plus. After long research and hundreds of customer reviews, I figured out the best way to backup presently was to stay with the 512 byte sector for now, until the "showboat" has stopped and the manufactures have ironed out all the issues surrounding the 4K compatibilities.
Summary: Bought a refurbished HP as back for other computers. Drive(750 gb)started acting weird with mouse doing crazy stuff and finally the drive just sat there, trying to reboot but in a never ending boot process. Have everything backed up, only loss is time and $$$ for a new WD drive. Have used lots of Seagate, et al in the past. Think it's the luck of the draw but decided I would prefer WD as a replacement. Why take a chance.
Summary: I've used quite a few of these drives, all of an OEM variety (so linked firmware may not help this, for what it's worth), and they've all been quite reliable, and fast enough for the purposes needed. However, and this might be part of the firmware issues, I plug these into USB2 docks on occasion, and under no circumstance will they write faster than 7MB/second. It's to the point where it's painful to use the drives in this way!
Summary: These drives I bought to go into a 4 disk raid array in a Synology cs-407. These drives arrived quickly and replacement went without a hitch. At the time of purchase they were $99 back in May 2012. Now they are down to $67 and are a bargain at that price. They are quiet, and did not have any of the firmware issues described in these reviews. It may have been an earlier batch, but I have not experienced any problems and they have been pretty much 24/7 operation.
Summary: I use several raid setups at my office and occasionally they drop a drive. Due to the fact they are from different manufacturers I'm not sure exactly what drive I need to use as replacement until I pull the dead one. Having a place to find the older server type drives is very helpful and very quick shipping also a nice feature when your worried about data loss. This drive was an exact replacement for my existing setup and installation was super simple.
Summary: I have installed this particular drive on all of my DVRs and for over 2 years none of them have failed. I am convinced these are teh best pick for any professional camera installation service.