[ubuntu] Hard disk naming

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http://ubuntuforums.org – Hi Im looking for help/info regarding how hdd's are assinged their ubuntu system names (sda, sdb etc..). I have a home file server running ubuntu server 9.04 with gnome desktop and some basic apps. I have a hdd which is playing up, and im trying to work out which hdd it is...I didnt have much luck searching, and i have a few questions Is it randomly assigned or is there a specific order? ie sda = sata0 What happens if i take, say, sdb out of a four disk arrary (a,b,c,d), then reboot will sdb still be missing or will the old c become b(and d become c)? Any help/links will be greatly appreciated (Hardware)