What need to know when purchase a SD card ?

Detail

Size

• SD card size

• Micro SD card size

Capacity

Speed class

Mark	speed (Lowest READ/WRITE speed)
	2MB/sec
	4MB/sec
	6MB/sec
	10MB/sec
UHS SPeed class1	10MB/sec
UHS SPeed class3	40MB/sec

Please see the below picture for a full compare.

Reference

1. toshiba sd_card

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