The link to supposed problems with SD card noise refers to RF signals which are way off in the inaudible range. Does it affect the recorder being able to write 1's and 0's? I highly doubt it and as has been said, I've never heard a problem even with slow cheap cards. One word of caution though, some counterfeit cards are being sold but usually the problem is that they say they are some capacity above 8GB but it real practice they only hold 8.
In a studio I doubt they are recording to an SD card. Usually there it's to a hard drive though that may be changing to SSD instead.
Everybody is ignorant, only on different subjects. Will Rogers
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