1TB is too big for 5400rpm.  Failed to work in 45 days.
929993
Purchased the item on Sep. 15, and it totally fell apart on Nov. 1.

1TB on 5400rpm might have been too large.  The disk started making slicing noise and audible knocks, and it started taking longer and longer to access files.
I cannot believe the quality of the workmanship and do not recommend this product to anyone else.

Besides, Amazon is not letting me exchange it, since it is over 30 day period.  We will see how Toshiba handles her warranty.
2665167
I brought this hard drive for my Lenovo Thinkpad T61 system and used this system very rarely.
A month ago the hard drive failed and I have tried all the options to restore it, but no success.
Planning to return it.
2101755
Bought this drive November 20th, 2015.  Installed it as a replacement the beginning of December. Drive died last night.  Was trying to create a Windows image on the external hard drive I use for backup purposes.  Failed halfway through.  Recommended running a "chkdsk /r"  I tried, and about 30% of the way in the drive froze and was rebooted.  Went into BIOS check and got a Long DST error asking again to run "chkdsk /r" again. Booted and started getting all kinds of S:/$secure errors.  Rebooted and the drive gets to the splash screen and goes through a shutdown-recycle-shutdown sequence endlessly.  Pulled the drive to try and mount it externally to recover data. No go.  Thought the "Smart Drive" software was supposed to prevent this.  Very disappointed in this purchase and will be looking to Amazon/Samsung for an RMA.
4931853
My 3TB seagate stopped functioning the same day it arrived in. It stopped being registered by any of my devices, figured this was a cable problem so I went and bought new ones. Nothing.
4559992
I got the well known problem of power supply with this unit and here's an easy and perfectly working solution (provided that it's a power supply problem which can't be solved with a new PSU) to recuperate all your data at zero cost.

[...]

If it's a physical drive failure then no other solution than expensive professional data recovery service (unit is made by 2 500Gb HD in RAID 0 configuration).

Lousy support from Lacie => Buy other brands!
4643727
Dismounts 3.5HDD WD and Seatage 2TB and 3TB drives randomly when drives are in use!

Haven't lost any data thank god, but can't work remounting them every now and then.

Went through Highpoint support web portal (incident http://www.highpoint-tech.com/websupport/portal/incident.php?id=22530), to only hear things like "Maybe you can try not to use desktop/green disk to see if improves." and "2. No better suggestion. You can try to put a fan in front of RS5212 to blow the heat" when I asked them if this might be caused by the fact that there's no active cooling mechanism involved.

Last drop was when I again told them the drives keep dismouting in cool conditions, they told me this:

"Hi,
We would like to RMA the unit. Please upload the RMA form and the copy of invoice

Please fill and upload the RMA form:
http://www.highpoint-tech.com/PDF/HighPoint_RMA_Form.pdf

We will issue the RMA number base on the information.

Here are some RMA policy to let you know
1. You purchased this from Amazon and the RMA is handled by US office. So this is international RMA.
2. Based on our international RMA policy, customer needs to cover both direction shipping cost to ship the unit back to us and return the unit back to customer
3. Once we receive the unit, we'll run the checking. If unit is defective, we'll replace a good one. If unit is good, it will be returned to customer.

If you agree on that, we can start processing RMA. Based on RMA form information, we'll calculate the shipping cost for you when we assign RMA number."

As I'm based in Australia, it means I'd def pay the price of the device I paid for just for them to check it irrespective to the outcome of the test. I told them I regretted the day I bought it.

Please save yourself the money you plan to pay for the device, and the time you might deal with their support, don't buy it.
112752
When working, it works just fine.  After 9 months, the power supply started failing.  RMA'd it.  Took some back and forth emailing to get a new unit.  Worked for another  year.  Now it's going out again.  Same thing.  HDDs dismount and remount.  30 seconds to 2 minutes in between.  If not paying attention, this will kill a drive (as it did the first time around).  I would not put my data at risk with this enclosure.

At this point my unit is 10 months out of warranty and can't be RMAd.  Since they seem to have not fixed the issue with their power supplies (and used the same ones when fixing my unit), I really don't want to have to RMA a product every 10 months (or risk my HDDs failing due to a constant mount-dismount).  I had to pay for shipping back for my RMA.

My RAID unit is on 24/7.  Connected with (4) drives.  RAID is JBOD.  All drives seen as separate drives.
3237169
UPDATE: The drive is completely non-functional, dead.  I only used the device maybe 5 times in the course of a month.  This product is a lemon.

I found out that drive cannot act as a boot drive, and this is the main purchase I purchased the drive.  With other drives, I did not have such a problem.  This problem is widespread, not just for one drive, and it widely reported on the Internet, such as Carbon Copy Cloner's support pages.

I am guessing that it should be adequate for backup, but I am worried that they did not implement the full standard (USB3 + SATA on the enclosure) in order pinch a few pennies at the consumers' expense, and will thus will fail in the future.  This may be why some are having a hard time with the drive.  So far I have not had such problems with data loss or drive failures, and thus no need to contact lousy support from WD and witnessing them not honoring the warranty.
3957558
I purchased 2 of these drives in June 2015.  Now in July 2015, one of them is dead.  I have only used it twice.  On several computers, the USB device is recognized, but no volume is recognized.  So I can't even format and start over.  The onboard storage controller appears to have failed.  I'm just outside the return window, so I guess I have to follow up with PNY to get the issue resolved.
4566382
My experience was very similar to the other 1 star review people here.  The 2tb expansion drive worked fine connected to a USB 3.0 port.  I tried the Crystal Mark benchmark 100 mb test and it got 134 MB/s several times.  Then after only half a day I could not get the drive working again.  The green light on the drive would pulse but the drive was not showing up on the desktop.  I tried restarting, cold booting, un-plugging, re-plugging in etc etc.  Then I tried the USB 2.0 ports no difference.  I even tried a system restore using Macrium Reflect & only tried USB 2.0 ports.  No difference.  (I also have a little 500 gb WD USB drive and that is still working fine.)

Luckily for me I am still using a desktop computer, so I went to Youtube and looked at a video of how to open up the plastic case on the Seagate drive and extract the hard drive.  These cases are really easy to open.  There is a seam and you just use a flat blade screw driver to lift up the lid.  After that there a few pieces of rubber and four screws (phillips head) to remove and then the drive can be pulled out backwards.  This seems to work best if you angle the drive up slightly first. (But be careful so you don't break the sata or power connectors.)  There is a tiny circuit board that connects to the standard sata and power connectors on the drive.

Anyway the drive inside my one was the Seagate 2TB  ST2000DM001.  Pretty sure this is the new 2 platter model.  This installed easily into my desktop pc and so far is working just fine.
As other people have mentioned the weakness in this model of external drive seems to be power supply and circuit board adapter.  For me this was just annoying but for someone with a laptop computer it would have been much worse.  A person with a laptop would have had to return the drive for a replacement which might have had the exact same problem.

And, as others have said WD 3.5 inch external drives fail too.  I had one fail a few years ago.

I think I might stick to only buying the little 2.5 inch external drives from now on, because these big external drives seem to have a high failure rate.  Just read the reviews here and other sites.  I wish I had!!
3382380
I was able to install and copy files to this drive initially, but when I tried to access the files to retrieve filed after sitting idle for 5 to 6 weeks, it did not work. The power was there but the drive was dead. Now with proprietary information on the drive I cannot return it, since the drive won't work and cannot be formatted or erased.
4835941
Drive did not initialize correctly only giving 1.6 TB.
3579651
Well when they specify any "single disc" drive--I assume they're ruling out any large TB drives.  Heck, I could probably take a single platter drive apart and fix it myself!  I don't even know who would buy a single platter drive today---what would it be about 80GB.  Maybe I'm being too literal in reading their description of the service they're offering.

 For SURE they are not going to attempt to forensically recover a 4 or 5 platter double sided multi-TB  SEAGATE HDD of early deaths and replace the drive--- for $9 a shot.  AND it IS the big SEAGATE's creating the market for this promised service in the first place.  Think I'll give this a pass just because it's not passing the ole "smell' test.
781885
Terrible.  Hard drive died 15 months into ownership.
3755969
Bought two drives, Installed them RAID 1 on a practically idle Linux machine in temperature controlled environment.  One drive failed after 54 days, machine would not even boot up until the drive was disconnected, so it looks like the controller failed.  SSD's fail, spinners fail, we know that which is why we have fault tolerant configurations and run backups.  You do too, right?  I'd give them two stars had it not been for the great pricing, absolutely effortless return policy and reasonable warranty.  So I got another one for free and my RAID is restored with no data loss and no down time.  NEVER gamble your data on ANY single drive.  This is decent performance at a good price with a great warranty.
3801143
Replace standard 1TB drive with this one, provided some improved response and shortened startup time by about 30 percent, this will vary by machine/system....uses less electrical power than full sized drives...installed this in a PC/system just took adapters for the smaller size
3758643
I am absolutely furious with my purchase on this drive. I usually do not post reviews but I had to make an exception for this one. After install this drive, I started a plex media server on it. After my content was placed on the drive, approximately 2 weeks after, further write to the drive was hampered. I proceeded to run the WD Data LifeGuard Diagnostics. Quick test showed that everything was fine, however the complete test did not even run for 5 minutes without failing. The results are shown below -

Test Option: QUICK TEST
Model Number: WDC WD50EFRX-68L0BN1
Unit Serial Number: WD-WX41DA55S9V6
Firmware Number: 82.00A82
Capacity: 5000.98 GB
SMART Status: PASS
Test Result: PASS
Test Time: 09:03:29, April 23, 2016

Test Option: EXTENDED TEST
Model Number: WDC WD50EFRX-68L0BN1
Unit Serial Number: WD-WX41DA55S9V6
Firmware Number: 82.00A82
Capacity: 5000.98 GB
SMART Status: PASS
Test Result: FAIL
Test Error Code: 08-Too many bad sectors detected.
Test Time: 09:07:19, April 23, 2016

Now I have a disk with brand new drive with bad sectors. I am really upset about this. What can be done?