AmesMUG: Stopping Time Machine From Nagging About Disks

[John Rearick]

I found an interesting article today that shows you can disable the  
Time Machine dialog "Use this disk for backup?" when you attach a new  
external hard disk.  Simply issue the following command in terminal:

defaults write com.apple.TimeMachine DoNotOfferNewDisksForBackup - 
bool YES

http://www.afp548.com/article.php?story=20080109213724586

John