02-28-2018, 06:01 AM
I'll defer to someone else for the absolute details which I do not claim to fully understand, but I think we're mixing up a few specs here.
This is a UHS-I card (as in Roman numeral I), but it has a UHS speed Class Rating of 3 (which means that it should never write slower than 30MB/s). UHS Speed Class 1 cards are never supposed to write slower than 10MB/s. These UHS-I cards (NOT the same thing as Speed Class 1) support read speeds up to 104MB/s vs. the pricier, super-speedy UHS-II cards (as in Roman numeral II) which support read speeds up to 312MB and write speeds that are nearly that fast. As far as I know, there is no such thing as a UHS-III card.
https://www.bhphotovideo.com/explora/com...emory-card
The Samsung Micro SD card w/ adapter looks to be an excellent deal. But the Amazon specs suggest it supports write speeds up to 60MB/s—much less than the SanDisk which claims to support write speeds up to 90MB/s which would make it 50% faster.
As I say, I'm no expert. I know these numbers may be marketing speak, and most people will never notice the difference. But if you're shooting 4K video or shooting RAW at 10 fps, the write speed is critical.
This is a UHS-I card (as in Roman numeral I), but it has a UHS speed Class Rating of 3 (which means that it should never write slower than 30MB/s). UHS Speed Class 1 cards are never supposed to write slower than 10MB/s. These UHS-I cards (NOT the same thing as Speed Class 1) support read speeds up to 104MB/s vs. the pricier, super-speedy UHS-II cards (as in Roman numeral II) which support read speeds up to 312MB and write speeds that are nearly that fast. As far as I know, there is no such thing as a UHS-III card.
https://www.bhphotovideo.com/explora/com...emory-card
The Samsung Micro SD card w/ adapter looks to be an excellent deal. But the Amazon specs suggest it supports write speeds up to 60MB/s—much less than the SanDisk which claims to support write speeds up to 90MB/s which would make it 50% faster.
As I say, I'm no expert. I know these numbers may be marketing speak, and most people will never notice the difference. But if you're shooting 4K video or shooting RAW at 10 fps, the write speed is critical.