I bought a 256 GB SD Card from AliExpress for around $28 and at first assumed it was junk but the reviews seemed to be good.
I used f3write and f3read to verify it does contain 256GB, and showed an average speed of 60 MB/s.
The result from black disk magic show:
I am wondering why it was priced so cheaply and what other tests I might do? Could it be it supports none of the other formats? Is there any way it could get around f3write? Generally, what gives here?