There wasn't any noticeable coil whine and I only used the existing back cover. I've since moved it under the desk so can't easily listen to it. Here's the audio spectrogram instead. The test occurs between the two double taps and went through a couple of read/write cycles.Thanks for the input. Just one question, does your new SSD make a bit more noise than the original one? In my case, when I had the 1TB, I couldn’t hear anything, but with the new ones (4+4=8), I do notice some sound when the drive is working.
I can hear it in your video, although I had to boost the volume to do so. Spectrogram (blue/red colour scheme) attached as well.