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1TB is too much, 750GB has already been done (the rev B 750GB Scorpio Blue is double platter, i.e. 9.5mm high) although it's only matter of time when 9.5mm 1TB hits the market.

Is the hybrid that much faster then? Why didn't you jump for 1TB WD (if your Mac can take 12.5mm drives)?

1TB is not too much. It's the minimum necessary for me to get rid of an external drive for a little while.

But I want the speed.
 
I'm thinking about getting a larger drive, too; I checked some reviews and there seems to be noise about a "known incompatibility" with MBP and these drives.

This was the description given by one reviewer:

The WD drive has a KNOWN compatibility issue with Apple's Macbook Pro line. The drive constantly attempts to park the needle and the Macbook will IMMEDIATELY start the drive back up. This is irrespective of the "Put the hard disk(s) to sleep when possible" setting. This constant back and forth causes the drive to cycle up and down in a way that will impact performance in the immediate term, and shorten the life of the drive in the long term. Unfortunately many people don't take a noticeable performance hit, so they don't notice the constant cycling of the drive until it starts to click after a few months.

Anyone on these forums experience this issue? Is this related to the issue with the EFI firmware update?

I had that issue with my MacBook Pro and a 640 Gb WD. I do not know if it also appears with the 500 Gb WD's. At work where I have a lot of noise it wasn't bothering me. At home even when there was some noise it was very annoying so I googled for a solution. Anyone who has a drive like this should look this up, it's some command you have to enter in terminal.
 
Can't say I've had any issues with the WD Scorpio Blue in 5 different machines it's been in.
 
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