I have valuable info on my Ubuntu partition, but it crashed, and I tried to get to it through Live USB with Mint 14, but it says it's read only. Can I make it writable too? So I can put it on my flash drive?
When you created your Linux Mint Live USB, did you include persistence to allow for changes (like transfering files or setting changes) to be made?
If not, I recommend using LiLi USB Creator or whatever you originally used to create a Linux Mint Live USB with persistence. I believe you need a 2GB or higher sized USB drive/SD Card to create a Live USB with persistence which may be needed if you have a lot of data to rescue, but the limit is a 4GB space reservation for persistence unless you want to have a more challenging time on a workaround.
If you can't access any other drives on your Linux Mint 14 Live USB it is likely because of a bug in the OS saying that it can't mount anything. I looked around on forums because I could not access any drives due to a mounting problem that I solved by typing the following lines into the terminal: press Enter after typing in each line.