Ramification of using large memory card

I think from around late 2013, Android (Kitkat) supported exFAT, but device manufacturers had to also do their bit.

Choderboy wrote in post #18863180
I think from around late 2013, Android (Kitkat) supported exFAT, but device manufacturers had to also do their bit.

Yes, that's right. The OEMs have to buy the rights from MS, and some do, some don't. And that is the problem for many of us. There are compatibility issues and that can bite you. My Android phone can't read exFAT files, and an Android tablet I tried a couple of years ago also couldn't.

Higher speed in SD card can really only archieve by using a faster SD interface. 60D is UHS-1, it really can't write much faster than about 90MB/s, and read about 95MB/s. Those UHS-i card that advertises to be able to read at 170MB/s, they actuall violate the SDA spec. To get that, you will need a specific card readers. Outside of that, no SD UHS-i device will go beyong 104MB/s.

As for the capacity of memory card, I do agree a few smaller cards are better than one huge card. But don't go too small. Nowadays, the lowest capacity card is likely to use lower quality or even reclaim memory. Better to avoid as well

I can easily explain this have have done it many times.

First, the speed label on any memory card, if not specified or if denoted as "transfer speed", it is always read speed because archiving a high read speed is always easier than archiving write speed. If anyone interested in knowing why, let me know.

SD card read speed is largely dictated by operating interface mode or speed (not max interface speed), not the SD controller or flash memory speed. When you see a 80MB/s read spec, the card is operating at UHS-1 104MB/s mode, which is the maximum UHS-1 interface from SD compliant point of view. The other speed modes are 50MB/s, 25MB/s and so on. The high speed mode is required to be backward compatible with the previous lower speed mode. The 30MB/s Sandisk has a max operation interface speed of 50MB/s. In realisty, you will most likely see faster than 80 or 30 with these cards with a proper card read. Sandisk, historically is very conservative about their speed measurements

In these days, all the speed mode is actually a FW setting. Sandisk basically updated the FW for Ultra to go from 30MB/s to 80MB/s.

Speed class is a entire different measurement. The requirement is to reach 10MB/s read and write for a predefine workload by SD associating. It is not sequential. And it has to be met when using the interface mode of 25MB/s.

I know it is confusing, that is why I will suggest don't read too much into it. Speed class is mostly useless these days. Sequential read or write are better judgement of how good the card or the memory is