However, unlike microSD cards, USB drives don't get covered in speed classifications like V30 or U3. This is because practically all external storage devices have a lower write speed than read speed, sometimes significantly lower write speeds. Now, like microSD cards, most flash drives are advertised for a transfer speed, which you should always transfer to read speed, not write speed. Now, when looking at flash drives, you'll see many USB versions thrown around and a lot of talk about how fast a drive is.
A note about read, write, and transfer speeds Why is it that the current crop of USB 3.0 flash drives don’t deliver full USB 3.0 speed Most of them max outaccording to manufacturer specificationsat 100MBps (800mbps) or less. If you want a Type-C-only flash drive, you can get smaller or higher capacity drives, such as up to a 256GB model available for the SanDisk Ultra Dual Drive, which is tempting me greatly because it can hold so many movies for offline viewing during those long cross-country flights - when those become a thing again. This makes the flash drive an extra-easy way for users to offload photos and files from an Android phone to their computer, even an older computer that doesn't have USB-C ports yet. You may notice that most of the drives on this list are multi-port flash drives, having a USB-C port on one end and a USB-A port on the opposite end. You can get this drive in either black or silver in capacities from 32-128GB. The read speeds on this keychain-sized flash drive are lower than most in this lineup at 108 MB/s, but the write speeds of 27 MB/s are still adequate for promptly backing up and transferring files.
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