Just try a quick one. If it works great. If it doesn't, try a full one. If that works, great.
If neither work, return for more advice.
Might be easier, given the relatively cheap price for microSD cards, to buy a new one and resist the temptation to reformat it!
You proberly right, I'll be interested if some one can point me in the right direction what make of sd card would be best, I got a cheap 64 gb off eBay think it was £12 plus delivery, 16gb will do just for music