3 ms·
> In the 90's harddrives often had a 7200 Hz whine which was enourmously annoying. The what now ? nothing in hard drive runs at that frequency
by ilyt 3y ago
> In the 90's harddrives often had a 7200 Hz whine which was enourmously annoying.
The what now ? nothing in hard drive runs at that frequency
- da768 3y agoMore like 7200 RPM, but that would be 120Hz. The motor would be driven by PWM though, that's more likely to cause sound issues
- tyingq 3y agoA deep dive into that topic...PWM drivers for hard drives, torque ripple, and reducing noise. https://www.ti.com/sc/docs/msp/papers/1998/bwhite.pdf https://www.ti.com/sc/docs/msp/papers/1998/bwhite.pdf