The SD Association that defines the SD card standard doesn’t actually define the exact speeds associated with these classes, but they do provide guidelines. There are four different speed classes—10, 6, 4, and 2. Class 10 is the fastest, suitable for “full HD video recording” and “HD still consecutive recording.”
Does Windows 10 use memory cards?
Yes, Windows 10 allow readyboost for Micro SD cards.However, there are some conditions to be fulfilled before you can use your microSD Card for ready boost. Here are some tips on what to look for when selecting a USB flash drive or flash memory card to use with ReadyBoost :