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Most computers have a "CPU busy light" with a sillo icon beside it that lights up periodically. But what exactly does that light mean? Is it turned on when the CPU is in Usage or when the hard drive I/O is up? I noticed more of a correlation with the disk I/O then the CPU usage.

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    The silo light should indicate disk I/O, not CPU activity. It means that your disk is being accessed (read from or written to). – user308986 Dec 31 '19 at 20:05
  • Thanks, your answer is probably correct then. I always assumed that light was called the cpu busy light but it would make more sense if it was called the hard drive light. – Nicolasome Dec 31 '19 at 20:21
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I actually have not seen such a CPU light. Are you sure you do not mean the Hard Drive light. Computers with Hard disk drives often have a hard drive light that goes on periodically when there is hard drive activity. Computers with SSD drives usually do not have such lights.

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    Agreed. I have never seen a "CPU busy light". Usually devices will have network and/or HD activity lights. – duct_tape_coder Dec 31 '19 at 22:08
  • Don’t know why but this seems more like a comment rather than an answer to me. – Valay_17 Jan 1 '20 at 8:39
  • This was a comment until it was moved from the comments to be an answer. Still looks like a comment, though. – user308986 Jan 1 '20 at 8:44
  • My comment got 4 upvotes as a comment and the OP agreed it, so I moved it. – John Jan 1 '20 at 11:56
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The silo light should indicate disk I/O, not CPU activity. It means that your disk is being accessed (read from or written to).

While I actually HAVE seen a CPU activity indicator, it was way back in the 90s using an add-on card that showed part of the address the CPU was accessing, and the card was located inside the computer.

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