Laptop hard drive LED on all the thime

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From a similar model laptop, I got a 20GB hard drive (Hitachi DK23CA-20).
When I swap it with the laptop's 11GB hard drive (Hitachi DK23CA-11), the
hard drive LED stays on all the time.     And the 20GB drive runs much
hotter than the 11GB drive, but it works without apparent problem.

Could the constantly-on LED explain the higher running temperature?

Is there anything I can do to check whether this is a genuine fault that is
limiting the operation of the drive or whether it is just an indication


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