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I have an X99 box with 32GB flash storage. It has a microSD slot, so I'm looking to expand, and won't have to be keep deleting watched movies to get new ones (the box is away from the phone line, so streaming is not an option over wireless — and powerline extension didn't work out much better either).
Question is: is that a good reason to buy Samsung's 128GB UHS-I microSDXC @ $30 (+ s/h), or will class 10 (i.e. 10 MB/s suffice)? Further, will this box actually be able to transfer data at those speeds, or are there other internal bottlenecks? Cheers.
Most devices should have UHS data bus meaning that to realize the full potential of your device you should be using a SD card that is rated UHS.
According to Sandisk, a class 10 SDHC card has a minimum of 10MB/s transfer rate.
UHS Class 1 also starts off with a minimum of 10MB/s transfer rate, so whether you use a UHS-1 or Class10 SDHC card, both should a similar minimum speed rating.
I've been using non UHS cards in mobile phones and cameras (min class 10 however) and recording fine at 1080p. Remember that the write speeds of flash memory is generally a lot slower than read speeds, so it's likely that a C10 card can actually read perhaps two or three times faster than it can write.