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SubjectRe: [LINUX-KERNEL] HDD Noise stopped with cat /dev/zero
On Thu, 17 Oct 1996, David Monro wrote:

> Dunno - but I have an old machine where I can here noises from the ancient hard
> drive (we are talking 8 year old 40Mb MFM here) when network traffic is going
> through the machine - go figure. (And no, it isn't the drive doing things -
> the disk select light (remember those?) isn't even on). If I have the sound
> card plugged in I get to listen to the traffic quite loudly too :-(
> I've also had at least two machines which made strange noises when the case was
> open and in quiet surroundings with no sound card or anything - again network
> traffic was triggering the noises, though I have no idea why I could hear it.
> I can remember one particularly strange incident where I could here noises
> when I was running a CPU intensive job (raytracing) as opposed to the machine
> being idle. I can only guess I am hearing subharmonics of the bus traffic but
> I find that hard to believe.
> Just one of those things I guess.
> David

This isn't as silly as it sounds, the first sound cards were just detuned
AM radios put on the top of the box, and I mean the metal box (I saw this
on the TV, so it must be true ... Oh, and I'm looking to buy a ... ).

The box had no kbd, no printer/screen/..., all it had was a row of
switches for programming, and a row of lights for the output. It was (one
of) the first micro computers tho ...

All you had to do was program the thing to do differnant ops, loops, with
differnat delays, and the radio picked up the interferance produced.

Unfortunatly as they had no permanent storage, the instrment never cought
on due to the half hour walm up (programming) time while the musician
twiddled the switches (one mistake, and it's start again time) ....

PGP key pass phrase forgotten, \ Overload -- core meltdown sequence
again :( and I don't care ;) | initiated.
/ This space is intentionally left
| blank, apart from this text ;-)

 \ /
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