[conspire] Janet Jackson vs. Laptop Hard Drives

[Syeed Ali]

On Mon, 19 Sep 2022 00:38:51 -0700
"Deirdre Saoirse Moen" <deirdre at deirdre.net> wrote:

> This is an old story that's come up in the news lately, so jazz bass
> geek Adam Neely has made a neepery video about *why*. Which is more
> interesting than all the misreporting I've heard.
> ...
> https://www.youtube.com/watch?v=-y3RGeaxksY

I also saw that video.

For anyone particularly interested in the topic, the comments have
some bits of insight and opinions the video author did not consider.

for example:

https://www.youtube.com/watch?v=-y3RGeaxksY&lc=UgzhDM47cneMoBlcsUF4AaABAg
> Alex McLeod
> 
> I wonder if the drives' rotation speeds mattered. Most laptop HDDs
> were designed to spin at 5400rpm (90Hz), but some were made to spin
> at 5200rpm, which is 86.67Hz, and pretty close to the frequency in
> question, or the 87.5Hz from the 'Vibration of Main Components' paper.
> 
> The bassline is also using F natural, so (pitched up) it's bouncing
> between 84Hz and 89Hz. The drive must be counting revolutions per
> second, expecting 86.67Hz (for a 5200rpm drive), but it's getting
> those additional signals from the song at 84Hz & 89Hz, and it can't
> correct for the error by adjusting its own speed. At ~109bpm that
> apparent rpm error would keep reappearing, so I guess at that point
> the drive shuts itself down.