DVD drive (?) won't disappear from disk utility

i was desperately hunting for a cd last night, and was going through various old cd is the vain hope i'd find a neglected blank one. I found what i assumed was a rewritable disc, which is something i haven't really been into, but seemed to be my saviour. i don't have toast so i went into disk utility to erase it. Except it wouldn't let me although i eventually managed to eject it
(the ejecting of disks had been behaving weirdly beforehand. Everything seems to be working ok except there is an icon in disk utility that i can't eject or unmount
Name : OPTIARC DVD RW AD-7170A
Type : Optical Device
is this the dvd drive? the now ejected disc? why can't i unmount it? It's there even after i restart my mac, many thanks

This is perfectly normal, it is your optical drive you can not unmount or eject it.
The thing with you ejecting of disk try:
PRAM Reset
http://support.apple.com/kb/HT1379

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