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Forum Discussion
2TB HDD Buying Advice for NV+?
I have an open case, # 17989710. My NV+ originally came loaded with 4x Seagate ST3750640NS 750GB drives, from which I upgraded to 4x WD20EARS-00MVWB0 using the one-at-a-time hot swap method in the summer of 2010. This went without a hitch, and performance was flawless until a few weeks ago. I starting getting SATA reset errors and saw the ATA error count on disk #4 increasing. I decided to buy a new WD20EARS-00MVWB0 and deal with the RMA on the bad drive later, figuring I'd keep the replacement as a spare or an external backup drive in an enclosure. Unfortunately, after replacing disk #4 the resync kept failing to the point where the NV+ wouldn't boot. Tech support found 13 bad sectors on disk #1 and 202 bad sectors on disk #2. They suggested that I clone disk #2 ASAP and disk #1 in the near future as well. This brings me to my question.
Since 3 out of 4 WD20EARS have problems, I believe the best thing to do is avoid Western Digital entirely. I need to buy at least 1 (but better yet, 2) drives right away to perform the cloning while the support ticket is still open. I've spend a lot of time reading reviews and comments about the 2TB drives on the NV+ HCL both here and all over the Web, but I'm still undecided. Forum user Papabear had good things to say about the Samsung HD204UI in another thread, but I'm a little gun-shy about "green" drives given my experience above. If you were me, which drive would you get?
Since 3 out of 4 WD20EARS have problems, I believe the best thing to do is avoid Western Digital entirely. I need to buy at least 1 (but better yet, 2) drives right away to perform the cloning while the support ticket is still open. I've spend a lot of time reading reviews and comments about the 2TB drives on the NV+ HCL both here and all over the Web, but I'm still undecided. Forum user Papabear had good things to say about the Samsung HD204UI in another thread, but I'm a little gun-shy about "green" drives given my experience above. If you were me, which drive would you get?
1 Reply
- Hitachi from the Hard Disk HCL
As for cloning the disk there's a good suggestion here: http://www.readynas.com/forum/viewtopic.php?f=24&t=59746&p=335992#p335992readysecure1985 wrote:
Simple Hard Drive Recovery
Here is a simple guide to quickly recover a failed drive using dd_rescue.
Here is a quick simple guide how to achieve this with a free Linux Live CD and a PC with two SATA connections.
Using a Knoppix 6.2 Live CD for this guide. Can be found at http://www.knoppix.net
Using dd_rescue command allows you to copy data from one drive to another block for block. This is especially useful for recovering a failed drive. Often when a drive fails, the drive is still accessible, it has just surpassed the S.M.A.R.T. error threshold. dd_rescue allows you to ignore the bad sectors and continue cloning the bad drive to a new healthy drive.
1) Connect your old drive and new drive to your PC
2) Boot up using your Linux live CD
3) Launch a terminal window.
4) Run fdisk -l to make sure the system sees both of the hard drives.
5) Run hdparm -i /dev/sdx on both of the drives to find which drive is your source drive and which drive is your destination drive
6) Once you know which drive is which you can start the clone process.
dd_rescue /dev/sdx(source disk) /dev/sdx(destination drive)
7) You will see the process start, just keep an eye on it, it might take a few hours for the clone job to finish, depending on the size of the drive.
Once the process is complete, there will be no notification, the transfer will just stop and you will see the terminal prompt again.
If you see a lot of errors or see that there is no more data being shown as succxfer: it means the drive got marked faulty by the kernel. At this point reboot the system and make sure you know which drive is which again, as it is possible they lettering might switch. Run the dd-rescue command again but this time with -r option. This will start the cloning again but this time will start from the back of the drive and will make sure to get the data that has not been cloned yet.
There is no guarantee this will recover your data, but there is a very high chance this will work and its free.
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