Can corrupted photos from a Samsung S3 be restored?

[AC Question]

Phone is a Samsung Galaxy S3 with a Lexar 32 gb SD card added after purchase.
A few weeks ago some photos taken with the phone appear corrupted (a block of color covering most of the image or image is pixelated). Phone is set to upload photos automatically to Google+ and the photos appear corrupted there too. Yesterday the phone shows a notice about "no SD card" or "SD card unmounted" or something. Now the phone does not even recognize the SD card.

So my photos are "saved" on Google, but still damaged. Anyone know of a way to salvage them?

Besides buying a new SD card, any way to prevent this happening again?

Thank you!

 

[Rukbat]

1) Buy a SanDisk card this time. It may cost a little more, but your data is worth more than any card.

2) The only way to "recover" the pictures is by hand - redraw them in a picture editor. You don't have an original picture with a black box laying over it, you have a picture of a black box. There's nothing to "recover".

3) The way to prevent this from happening is to check your data before manually backing it up, then check the backup. Autobackup is what causes problems like this. (And back up to at least 2 destinations - a PC and a cloud account, 2 cloud accounts, etc.)