Chances are that when you dropped the card, one of two things happened.

1. You either broke a very tiny connection in the card itself. This is very difficult to repair. You can try sending the card back to the manufacturer for warranty repair.

2. Some kind of small debris or coating got onto the contacts. You need to clean them off by wiping them vigorously with a soft cotton cloth. You can also clean them VERY CAREFULLY with basic glass cleaner (NO Ammonia!). Be sure that no liquids get into the rest of the card.

Your best bet will be to try wiping the contacts clean. If that doe not work, send the card in to be repaired.

Is that a mini-SD or a micro-SD? Most phones use the latter.

Either way, the data on a flash memory card is based on stored electric charge, not something that is disturbed mechanically. As long as you haven’t done serious physical damage to the card, it should still be readable.

First thing to do is clean it off. You can wipe down the gold contacts on that card with rubbing alcohol and a Q-Tip if you have these available. Some people recommend a pencil eraser for contact cleaning, which can work, but can also scratch the contacts if there’s any grit in there.

If your phone still can’t read the card, try another SD reader. Most SD readers (the kind that are pretty common on PCs and laptops these days) read the full-sized SD card, but your mini or micro probably came with a physical adapter to let you use this card in standard-sized devices.

If the alternate reader still doesn’t see your files, you may have done some internal physical damage to the card. There’s not much you can do at that point, these are very small and hard to fix unless you’re an expert.

a MiniSD card is completely solid state, so your dropping it shouldn’t have resulted in any data loss. If my memory serves me correctly, the MiniSD cards don’t even store the information magnetically either, but by “fuses” that allow or restrict electrical flow. My suggestion would be to use an eraser (like on the back of a pencil) and clean the contacts and try another reader. My best guess is that all the files are still intact.