Storing digital files in SD / SDHC / SDXC is very good. But, in recent days, it has been seen that Memory cards gets corrupted. When a memory card is corrupted, You can not save any digital files in it. Moreover, you can not access the previous digital files as well.
Take back-ups of your cards on frequent basis as the back-ups can be helpful for you in the case you meet data loss situation.
What to do when you have not taken Back-ups?
There are many data recovery software available on Internet. You can download a robust and read-only Photo Recovery Software if you want to recover Photos, audios and videos from any digital storage media.
I have used a very good Photo Recovery Software. It is Deleted Photo Recovery Software. It recovers photos, audios and videos from formatted or corrupted digital media. It can recover all the formats of photos, audios and videos. It is developed in two version for the use Mac and Windows users.