SSDs are basically what happen when you take the tech in an SD card and then add enough reliability, throughput and resiliency to actually work as the main storage device for somethingexpected to last for years like a personal computer or server.
Those cards are cheap but they don’t last with accurate storage through as many read/writes as an SSD by orders of magnitude.
Most of the cheap SD cards are also using a slower interface, but it does vary by which standards you’re comparing. SDUC is faster than older sata II and sata III connections, but significantly slower than the M2 interface you see on many current SSDs.
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