135 of 139 people found the following review helpful
Solid, but problems with LLC,
Amazon Verified Purchase(What is this?)
This review is from: Western Digital Caviar 2TB SATAII 64MB Cache 3.5-inch Green Internal Hard Drive OEM (Personal Computers)
I bought a pair of these to go in my NAS, but was unpleasantly surprised to notice they suffer from a 'Load Cycle Count' problem - which is fairly well publicised on the net I later found out. For those who haven't followed this, the WD Green disks implement a power saving feature where they ship the heads of the drive if the drive has been inactive for a few seconds. Linux-based NAS systems (which is most of them) write out small fragments of data every minute or so, which means the drive has to unship the drive head. You can query your drive's LLC through S.M.A.R.T. and see it ticking up by about 1000 a day.
The drives are specc'ed to a max lifetime LLC of 300k, so you can see where this is heading (groan). It's very poor that there hasn't been a fix for this straight off the bat after 3-4 months since it was first noticed, other than WD telling people to attach the drives to a windows pc and run wdidle.exe to 'lessen' the problem (this reduced the problem by about half).
Kinda wishing I'd bought Seagate Barracuda's instead.
Tracked by 4 customers
Sort: Oldest first | Newest first
Showing 1-10 of 13 posts in this discussion
Initial post: 9 Oct 2010 12:12:31 BDT
Dr. Richard Dudley says:
Great review, but can you please tell me how I query the LCC via S.M.A.R.T? I've tried the net but I'm getting nowhere.
I'm using the Caviar Green as a backup drive - not my main system drive, but I'd still like to know how the LCC is behaving.
In reply to an earlier post on 24 Oct 2010 20:06:46 BDT
Under linux you can install smartmontools which will give you the program smartctl. Then you can issue:
smartctl --all /dev/[your_device]
Which will give you:
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 171 169 021 Pre-fail Always - 6425
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 22
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 134
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 18
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 12
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 357
194 Temperature_Celsius 0x0022 115 100 000 Old_age Always - 35
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 2
200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 0
There you have it (193).
In reply to an earlier post on 22 Nov 2010 12:35:00 GMT
Panagiotis Atmatzidis says:
Excellent review, however the next time be so kind to provide us with your exact NAS model/firmware.
I bought these from Amazon. My ReadyNAS has issues with current firmware but reading the 4.1.7 release of ReadyNAS NV+ writes:
8. Added support for WD drives that don't support TLER.
ReadyNAS is linux based as far as I know. So if this problem is solved under ReadyNAS, it should be solved on other NAS also (including yours).
Posted on 29 Jan 2011 20:26:38 GMT
David Smith says:
yes i had the same problem also, 3 died on me in 9 months wd said it was because i was not zeroing the drive i dont think so wd bad firmware then trying to shift the blame to you shame on you wd i wont ever buy their hdds again.
Posted on 2 Mar 2011 11:49:42 GMT
I am fed up with "green drives", everyone I bought has had to be returned or died 3 or 4 days out of warranty and the net effect of this activity is a totally non-green result of wasted manufacturing, delivery, time and resources. Manufacturers would do better to focus on reliability and longevity if they want to be green, but that is not conducive to a progressive income is it!
In reply to an earlier post on 2 Mar 2011 11:57:26 GMT
I have 4x 2TB WD20EARS still going strong after a year! *knocks on wood*
In reply to an earlier post on 2 Mar 2011 13:06:54 GMT
I have got through five (two x WD's), three failed in warranty, 2 out of warranty - one on its 369th day from purchase. I do have a couple more approaching their 1st year birthday, if it wasn't for the ton of data they hold I might be tempted to sacrifice them. I have a Maxtor ~70GB disk in use every day since around 2000 - still working fine.
In reply to an earlier post on 2 Mar 2011 13:33:16 GMT
How did they fail? Some bad blocks started appearing, reallocated sectors, or did the HDD stop spinning up? I'm curious to know.
In reply to an earlier post on 2 Mar 2011 14:38:08 GMT
These were installed in a Windows Homeserver (WHS) and a linux web server. WHS merely reports disks as "missing" so to diagnose I would need to install it in another machine (and Amazon make it too easy to return for that kind of hassle).
Linux reported group descriptor errors and block bitmap failures which could not be recovered, in fact the machine "wobbled" when I tried to recover, if it wasn't so sad it would be funny.
So apologies I cannot be more precise. I know it may not be fair to blame the green credentials but before they were available catastrophic HD failure was something that happened to other people, it was as common as losing a cheque in the post.
In reply to an earlier post on 2 Mar 2011 14:49:36 GMT
Thanks for the details. They (the HDDs) are very cheap though. I guess you get what you pay for, as always. The Samsung 2TB are in the same price range, and I've two of them in the same RAID5 set. I should really expand to RAID6, 6x 2TB HDDs is asking for trouble!