The regular HDD from WD will not work in RAID.
BS. I just did RAID1 on 2x WDC Black 1TB drives two days ago for a customer.
WD drives don't support TLER anymore since 10/09 which is user for ERROR tracking when running in RAID
That is a non issue. You can STILL RAID these "normal" WD drives. TLER *improves* error handling, that is all. It does not prevent the use of RAID on HDDs not supporting TLER. As long as you have a good RAID card, this really should not be an issue.
Also to prove that you CAN STILL run RAID on the new drives:
http://www.wdc.com/en/products/products.asp?driveid=488However, WD (and even I) do not recommend using these drives on RAID5 and mission critical servers/workstations,etc.
Desktop / Consumer RAID Environments - WD Caviar Black Hard Drives are tested and recommended for use in consumer-type RAID applications (Raid-0 / RAID-1)
All I'm pointing out here is that you CAN run RAID on the newer WD HDDs.