On a 500G MBP running Lion what's the best size to partition a 2T WD external hard drive to for Time Machine? Thankse

Just picked up a 2T WD external HD for my new MBPro with 500 G drive. Looking to use part of the external drive for Time MAchine. Not sur if I should designate 1T of it or 750G. I'm running Lion. What's the best way to format the external drive. Disk Utility?
Thanks,
Dennis

Ask in Lion: TimeMachine / MacBook Pro even - this is workstation territory
I would not use the same drive for data and for backups.
If I had to, I'd make a partition large enough to boot your Mac from though, whether 50-500GB to clone your system. 
You should still be able to use Lion's Recovery boot mode.
I don't think there really is much choice in what to format with, unless you want to spend over $100.

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