Quote:
Originally Posted by ilovejedd
Most USB flash drives are just crappy. I don't think I've ever seen a USB2 flash drive get anywhere near close to real-world max of 40 MB/s for USB2.
Note, I've seen reports of file corruption when using exFAT drives with the File apps so be wary of that.
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I think they are so small they have heating issues. They have a limited amount of surface area from which to dissipate the heat adequately. The really small ones are even worse. The Samsung 64GB I tested almost completely disappears when plugged into a USB port on my MacBook Pro. Only about 1/4” sticks out and that portion is plastic. (See attached image.) It gets extremely hot. It runs much cooler though when using an adapter cable with my iPad Air 2020. That is probably because the adapter cable port is completely exposed allowing more heat dissipation.
I reformatted the two flash drives I tested to APFS. They both ran about twice as fast with APFS as they did with exFAT. But they both ran way slower on the iPad than on the Mac, and on the ipad they never got near the theoretical top speed for USB 3.0 on a flash drive, which seems to 150MB/s. One got close with 123MB/s on the Mac though.
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