i bought a new iMac last week, but exchanged it for a new one tonight because of it had a bad screen... ANYWAY now that that's over with, i've noticed that my new iMac has a different optical drive than my first one. interestingly, both iMacs were manufactured in China during week 10 of production, but they both have different drives. my first iMac had a "PIONEER" drive, and it was quiet when i would insert/eject a disc. my new iMac (which has a better screen) has an "OPTIARC" drive, and it makes a bit of noise when a disc is inserted/ejected (the noise isn't really a big deal) is it normal for the same model iMac, especially those from the same production, to have different superdrives?