Pros: The drives inside the units I ordered are HGST HDS724040ALE640 0F14681 - 4TB 7200RPM SATA 6.0GB/s 64MB cache. I ordered five units and was sent two cases of three, with a drive removed from one case. They all have the same manufacture date and firmware. The drives ordered as internal drives will cost about $75 more than ordering these external Touro Pro units and popping them apart for the drives, so this is the way to go if you're on the cheap for big storage and don't care about the 2 year warranty. Warranty might be a bigger deal if it were 5 years, but I'm not too worried about the drives lasting 2 years. Even if one fails, I could buy another two of these with the money I saved over buying the internal standalone version and still come out cheaper by $75. Case is easy to get apart once you figure out where the clip points are. Drives are quiet, fast, and all of them showed up working perfectly.

Cons: The case is not designed to be opened and then reused/reassembled - there is literally no way to open the case without badly scuffing the edges of both the black plastic side panel and the silver center piece, which is all one solid band around the drive. You can see how easy the silver section scuffs by running the sharp edge of a small flathead screwdriver across the silver section somewhere like the back of the drive. Any little nick will show up. You also cannot open the enclosure without destroying the plastic clips on the black panel that clip into the center silver band. Opening the external enclosure will void your warranty, so if you pop them open, basically hope that the drives are going to last the two years that you would have been able to replace them in had you left the cases intact. As above, if you open the enclosure, it's going to be very obvious.

Overall Review: I wanted five matching drives to put into a Drobo N, and these are great for that. If you're disassembling these drives, the panel to remove is the one on the right when the drive is sitting vertically with the LED facing you on the front. There are 7 plastic clips on the black side panel that clip into the silver section - two on top about 1" from the outside of the drive, 2 on each long side of the drive about 2" and 4" down from the top, 2 on each bottom corner and 1 on the bottom center. I had the best luck with prying in by the LED and popping the bottom corner clip, then the bottom center, then working back across the front edge to get the two front clips and then the top clip closest to the front. From there, you can give the panel a good yank by hand and pop the remaining clips to separate the drive. It just lifts out from there - getting the SATA to USB hardware off is pretty straightforward, two screws and that's it.

Pros: Price The drive inside is a HITACHI Deskstar 7K3000 HDS723020BLA642 (0f12115) 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" It currently costs twice as much to buy that drive bare than it does to just get this external. Drive has been running fine for the past few days. Using it as a boot drive and the single drive feels snappier than my previous 2 Seagate Barracuda 7200.11s in RAID0 and the WEI didn't change.

Cons: Runs hotter than my Samsung EcoDrives, but that's to be expected. ~25c is certainly not bad at all though, so this isn't really anything to worry about.

Overall Review: I never plugged this drive in externally; I immediately tore it open and got the bare drive out to use internally. Please note that if you plan on doing that, it is near impossible to open it without damaging the case and will most likely void your warranty.

Pros: Write Speed 122MB/s with TeraCopy, Read 105 MB/s TeraCopy. (Part of the difference was because of the hard-drive it was coping to. Crystal Disk Mark: Read 130.0 MB/s, Write 128.0 MB/s It out preforms both of my internal SATA drives. Crystal Disk Mark of my internal WD Black Caviar 500GB: Read 99.48 MB/s, 95.93 MB/s Crystal Disk Mark of my internal 2TB Hitachi: Read 113.5 MB/s, Write 107.7 MB/s Preforms very nice, did have some trouble with USB 3.0, but it turned out that my driver on my computer wasn't working properly. It's USB 3.0 and Cheap

Cons: The USB cord is kinda short. Ordered a longer one, should be here in a few days. It's not USB 4.0 ;)

Overall Review: I bough this solely for backup, as I have 2.5TB in my computer and wanted to keep it safe. As I've only used it to back stuff up, I'm not constantly write tons of information to it so I haven't payed that much attention to the temp. Unlike one other unlucky customer mine did come with the USB cord. I have to say though it's very simple I do like the backup software. Unlike a WD hard-drive my mom has for backup that doesn't let you choose what folders to backup or a time to backup, this one does. That's about all it chooses, you can't exclude specific file types or anything, but since it came for free, don't have to many complant's. The biggest complaint would have to be that the backup software doesn't minimize to Notification Area. Core I7 2600K 16 GB Ram Asus EVO P67 Mother Board (with 4 USB 3.0 ports, (two on motherboard, two Motherboard Header) 500 GB WD Black Caviar 2 TB Internal Hitachi. GTX 560Ti

Pros: cheapest way to enjoy 4tb 7200rpm HDD goodness these don't make any funny sounds during high use Thanx NewEgg for the Sept'2013 30% off MSRP sale.

Cons: cracking open limits warranty to HDD made date. runs over 50°c so not for cheap NAS enclosures, get Seagate 4tb 5900rpm - they run much cooler.

Overall Review: with 2 screwdrivers i had these open in under a minute. got inside Deskstar 7K4000 drives made 6mo ago in Taiwan - sweet (warranty is 3yr on bare drives) I put 2 in my PC case as SATA3/AHCI formatted as GPT/NTFS netted 3.7tb of same partition usable space. in Win7ult you can RAID1/Mirror these, but you may be better off using Allway Sync because if you ever need to force shutdown your PC, the Mirror rebuilding can take a few days while slowing your PC down dramatically. Allway Sync works when your not doing anything else, and does not care if you force shutdown.

Pros: The second one received after RMA'ing the first, tested perfectly and works as a backup device. I bought it on sale, so the price was fantastic, although compared to prices just a few years ago, it was still expensive. Newegg delievered it in just a few days, and very inexpensively.

Cons: The first one received could not reliabily record data; less than half the files copied to it verified. The SMART info said it had thousands of operating hours, although it was sold as a new device. The second one has the SMART interface disabled, so it is impossible to tell its age. Nevertheless, despite the fact that it sits directly in front of a large floor fan, after a few hours of use it repeatedly tells the computer that its temperature is critically high. I bought this disk to replace another that said it was failing. By the time I received a working disk and had tested both of them, the old disk would not read. Who knows what was lost?

Overall Review: Consolidation in the hard disk industry indicates that it is concerned with competition from SSDs, which are sold by memory companies. Hard disks have some natural advantages that are not going away: They store much more data, they are less costly per byte of data stored, and they are more reliable. Yet all the hard disks, from two manufacturers, that I have bought recently have taken several RMAs to receive one that works. Why is the industry competing by putting its worst foot forward? Now is the time for the industry to celebrate its natural advantages and adhere to its traditional quality standards.

Pros: Price, appearance, quiet

Cons: drop off computer

Overall Review: I had two of the 3TB models in my 20TB collection of movies (Guess I should break down and use a RAID with higher end drives) They read and wrote fine, just kept dropping off so the compuer didn't see them. Rarely have I ever had that problem with other drives. Sometimes twice a day I would have to unplug and replug them, gets old. Ended up using them as back ups where they sit in their boxes, work great for that. Replaced with Seagates, almost no trouble with those. WD has given me mixed results, I have a 3TB MY Book with no trouble at all but a few months ago I had two identical WDs both got bad after around 2TBs each. Stopped writing, kept freezing the computer, couldn't even transfer to other drives as the transfer rate was 1-5kbs at USB 3.0 !!! Had a Toshiba that lasted a few days after the year warranty. Tried Samsung, but just as nonpowered back ups. Anyone have any ideas for large movie collections thats more reliable? Anyone try SSD? (Know too expensive now, but in a few years, who knows?)

Pros: $150 shipped is a bargain price for a Hitachi Deskstar 7K4000 HDS724040ALE640 (0F14681) when you crack open the case.

Cons: Runs warm. Around 39 degree Celsius vs 31 for an SSD and older 7200rpm HDD in the same case.

Overall Review: The case was pain to open and not re-usable.

Pros: Lowest priced 7200rpm 4TB at the time of purchase (1 year ago). Purchased this drive knowing that it contains a 4TB 7K4000. Many times with these external drives the problem lies with the controller and not the drive itself. Purchased this drive so I could remove the drive from the enclosure and use it as a internal drive.

Cons: Cheap controller. Many of the complaints I'm hearing about the drive is about the controller failing. Many people are thinking that the drive failed when it fails to detect or disconnects, problem lies with the controller and not the drive.