Some of the things you're trying to buy cheap are off-brand, and there are three problems: Will it work? corresponds to the specified properties? Is it reliable? Haven't had it long enough to speak about reliability (only 1 month of use so far). I can only say: so far, so good! works, no problems with formatting (formatting took less than ten minutes, I connected it to the tablet, pressed OK and the tablet did everything it needed automatically). The card actually holds 560GB (but remember, never fill a MicroSD card more than 80%) and the transfer speeds are decent (note, if you want blazing fast then MicroSD might not be the type of storage , which you should look for ) .
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