Removing undeletable partitions on SD Cards

Sometimes Computer Management won’t let you use the entire SD Card. (By not letting you extend your primary partition.)

To fix this you need to clean the card up. Warning: It will erase the contents of your card.

Run the following in a cmd prompt:

diskpart
list disk

At this point, find your SD Card. (Easiest to do by identifying its size.)

Now run:

select disk X
clean
create partition primary
active
format fs=fat32 quick
assign

(Where X is your SD Card drive.)

Source

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