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Western Digital Caviar Black RAID problem, help needed

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November 15, 2010 9:07:40 AM

I recently got 2 units of 1TB WD caviar black sata 3 hard drive with 64MB cache. I configured them to RAID-0 and after looking for some performance comparison at google I came to know that these caviar black are not suitable for RAID setup due to its TLER timing of 8 sec, and RAID needs 7 secs. It has a good chance to drop out of RAID and can cause damage to my data or hang the system periodically every few minutes and resume, so which makes the PC as good as unusable!!!

caviar black produces after october 2009 cannot support TLER-ON using the WDTLER utilities as they are factory locked to TLER disable state.

So hope you understand what my problem is, I bought them for my RAID setup but 5 days after using it I came to know that my hard drives are not for RAID!!!!! what a stupid I am and WD is! I got them on 1st of November 2010.

can anyone help me how to make the raid works fine? Or can you please tell me what are my chance to get on the trap of system hanging and RAID drop usually?
I am using windows 7, but will install ubuntu and solaris later after knowing the possibilities of using RAID-0 on it.

If I use the WDTLER utility, what damage I will cause to my hard drive?
November 15, 2010 1:55:12 PM

people please help me or advise me if i need to replace the caviar black with RE3 caviar.
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a c 372 G Storage
November 15, 2010 2:55:00 PM

Some people have prblems with WD drives that don't have TLER, others don't. It seems pretty hit or miss. When I was running a RAID 1 on an nforce4 board one of the drives would drop out randomly after 3 - 6 months. Of course, rebuilding a RAID 1 array is simple. In RAID 0 you will lose everything.

Regardles of running RAID or not, I always recommend a good backup strategy. If you don't keep good backups, you have no one to blame for lost data.
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November 15, 2010 5:52:46 PM

so is there no way to recover data from dropped RAID, actually I don't have any extra hard drive, external or internal. so i need to plan accordingly. Can you please tell me what actually cause the raid to drop? any good example will be appreciated.
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November 16, 2010 9:24:34 AM

so is there no way to recover data from dropped RAID, actually I don't have any extra hard drive, external or internal. so i need to plan accordingly. Can you please tell me what actually cause the raid to drop? any good example will be appreciated.
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a c 127 G Storage
November 16, 2010 10:08:50 AM

You won't have any problems, until one of your disks experiences a bad sector (caused by BER). Once your disk tries to recover, it is in risk of being detached from the RAID array if it doesn't return the requested data within 10 seconds. That's what TLER does; it gives up after 7 seconds and returns an error, rather than continuing to recover the corrupted data block.

They want you to spend alot of money on what is essentially a bugfix. My advice: don't! Find other ways to store your data, like FreeNAS or other solutions, that do not require you to buy expensive RAID edition models.

And don't play with RAID until you got a solid backup of your most important files! You'll lose data quickly; RAID implementations available on Windows platform are not very reliable.
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a c 372 G Storage
November 16, 2010 10:30:42 AM

islammanjurul said:
so is there no way to recover data from dropped RAID, actually I don't have any extra hard drive, external or internal. so i need to plan accordingly. Can you please tell me what actually cause the raid to drop? any good example will be appreciated.


There are ways to recover a raid 0 with some third party tools, but they aren't guaranteed to work. RAID 0 is not a true raid. All it does is increase performance. A true RAID is for fault tolerance - i.e. keeping your system up and running if a drive fails.
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November 23, 2010 12:06:48 PM

Best answer selected by islammanjurul.
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