How to fix " sd card unavailable " ?

Nov 25, 2018
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How to fix " sd card unavailable " ? I was transferring some files from phone storage to my 64gb sd card and the card was suddenly/unexpectedly removed ( i don't know why). Don't know what to do so I turned off my vivo y53 phone and turned on again, and it says "sd card unavailable. Can this be fixed? Please help. Thank you.