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my tb is a WD caviar black--

"WDC WD1001fals..." according to DU which is identical to my WD caviar black
 
Why would you be disappointed in the WD1001fals? Isn't that the better Caviar Black lineup, with 32MB cache etc:

http://www.wdc.com/en/products/products.asp?driveid=488

As opposed to the mid range Blues like the WD6400AAKS with 16MB cache:

http://www.westerndigital.com/en/products/products.asp?driveid=394

By the way, Mike at xlr8yourmac received the WD6400AAKS you were hoping for:

http://www.xlr8yourmac.com/systems/2009_MacPro/2009_MacPro.html

Wait I'm asking about the 640gb hdd models not the 1TB ones from Apple as a BTO.
 
Right, what I'm saying is that personally, I would have hoped it was a Caviar Black series (ending in ALS like the 1 TB model mentioned), not the Blue series (AAKS models). In other words, this would have been my stock 640 of choice:

http://www.wdc.com/en/products/products.asp?driveid=551

Here's a good comparison of 640 GB HDs at X-bit (17 pages!):

http://www.xbitlabs.com/articles/storage/display/640gb-hdd-roundup.html

To quote them: "Do you want the fastest drive for a home computer? Take a Western Digital Caviar Black." But they liked the Blue for a server, so depends on your use.
 
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