External hard disk speed faster than 4200rpm?

[ACfly]

Hi, I am about to buy my external hard drive for time machine for my MacBook Air.. I noticed that some disk drives are faster than 4200rpm.. Will i have problems with these drive with my MBA?

 

[ayeying]

no.

 

[hotdamn]

see, the macbook air's harddrive is tinier than the one in macbooks, so it does not need to rotate as fast.

hope that makes sense.