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I have noticed that on some of the higher speed cd roms they will spin reguardless of cd's being in there or not. I am led to believe it is some sort of spooling. So that when you do try to access the drive it is already spinning and takes less time to get up to speed and thus shorten access time. I have a 52x cd rom that appears to run all the time except when it is open. I hope this helps.
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