Isn't Purple for things like camera feeds? Good on writes, bad on reads.

puzzlingcaptcha · on Nov 20, 2020

This seems to be the conventional wisdom but I can't say I've experienced it in practice. They have less cache than Reds and the firmware may be tuned for writes but I think it's mostly down to different market positioning/branding & price. You can compare the two: https://documents.westerndigital.com/content/dam/doc-library... and https://documents.westerndigital.com/content/dam/doc-library...