Seagate ST4000NM0023 Constellation ES.3 4TB 7200 RPM 128MB Cache SAS 6.0Gb/s 3.5 Internal Hard Drive (Bare Drive)

I did not realize this was a renewed drive or I probably would not have purchased it. Deliver was very fast. I had a drive in a mirrored array down, and didn't want to rely on a single drive for long. Excellent vendor.

The delivery was much faster than estimated when I placed the order! The product was exactly as shown and described. All 5 drives worked when installed.

Very easy to install...working properly in our NVR system.

Excelent for Raid configurations, i used a Raid 5 with 4 hdd no problem at all.an it's very fast.

These are not reliable drives. I bought these drives for my home NAS system. In just 9 months I've already had 1 of the 6 drives fail. If you search with your favorite search engine for "hard drive failure rates backblaze", you'll find the Seagate has the highest failure rate of all the brands. With the Constellation (NM/DM) models having some of the highest failure rates for Seagate. Do yourself and your data a favor and buy a different brand.

Found out too late that this won't fit my (or most) desktop PC. The connector is SAS, not SATA, and there is no such thing as an adapter. This should be called out more clearly in the product description because this drive shows up in searches for SATA drives.

very very GOOD!!!

Comes up under a search for SATA drives. Too easy to get by mistake. I’m sure it works fine if you have an SAS controller. Be careful, i’d say. At least they have a good return policy and the packaging was well labelled.

I paid a lot of money. I'm praying it won't break. It's functioning properly.