Best MicroSD Cards for the Galaxy S9

SanDisk 256GB A1 Class MicroSD Card

While SanDisk recently announced a crazy big 400GB card, you'll probably never need that much space on a phone. That said, the Galaxy S9 is one of a few phones than can actually accept a card over 256GB. So keep that in mind.

However, if you want to get nearly the highest amount of storage possible without spending an arm and a leg, get the SanDisk 256GB A1 card. The higher the storage limit the slow the card. Although SanDisk claims this new A1 standard breaks that mold.

The company guarantees its A1 card will make phones open apps and games quicker. Delivering better performance throughout. "A1 can manage random read input-output access per second (IOPS) of 1,500 and write IOPS of 500, so it can quickly open apps and process accompanying tasks, such as audio, graphics, saved profiles, and in-app permissions."

Basically, load times like opening apps and games are extremely fast. It's a bit more expensive than most 256GB micro-SD cards, starting around $199, but is often on sale for under $120. Giving you tons of storage and the best performance at the same time.

Buy it Now on Amazon for $107 (or on sale for $75)