We thought 256GB was the highest MicroSD capacity, but Today Western Digital proved us wrong with its newly introduced 400GB SanDisk Ultra microSDXC UHS-I card. This is actually the largest-capacity microSD card available on the market.

With this new SanDisk 400 gigabytes MicroSD card, users will be able to transfer files upto speed of 100MB/s and goes as SDXC UHS-I class of a card. This memory card is rated as App Performance Class A1, which signifies that the card can run apps as well.