Computer can not read your drive?
Check your data on it, be sure your data is still there. Because this is often is the case that data loss then computer can not recognize it.
Try 4Card Recovery to check it. It is a useful recovery tool.
If you find anything lost, you can use it to restore your data.
However, don't write anything on it now, because once the old data changed or overwritten, you won't be able to recover it any more.
First, download 4Card Recovery on the internet and install it on your computer.
Next, run it and select all to recover so that you will not miss anything.
Then, click the ‘ next’ button to scan it, and you are supposed to wait for about ten minutes here. So to be relax, and do not get into panic if you find it is keeping scanning.
Finally, store your recovered files on other part.
Have a try.