are you using WIndows 10? previous versions cannot deal with the multiple partitions on the card.
was your card working previously without any problems? if it was working fine for a while, you might have corrupted your card, which explains why it became read only.
In that case you will need to re-write your card using the image here in the forum and then after that install the latest software on it, preset collection, etc.
I recommend you find a windows 10 or mac machine to backup your presets and samples.