I took some photos home from work to edit at home. I was working on a PC and transferred some files across to the SD Card ready to edit. However, when I put the card into my Macbook Pro it completely wipes all the photos/files from the card! I try putting the card into my camera to see if it is just my Macbook playing up; nope, all files are gone. Any reason for this and/or any way of getting them back quickly?