Just wanted to share a tip from my experience when my memory card was formatted by error. I got the following trick from internet to retrieve photos or data from formatted or damaged memory card.
Photos can be retrieved from formatted or damaged memory card
Firstly - don't panic.
If you accidentally format a memory card there is hope - in fact you should be able to recover all the photos on the card. If the card becomes corrupted - there is also a strong probability that most of of the photos will be intact and recoverable - here is a step by step list of things to do, and the equipment and software you need.
1 - stop taking photos - take the memory card out of the camera and put it in a safe place.
2 - equipment you need - you need a card reader, a computer (faster the better), about the same amount of space as the card (eg. 4gb for a 4gb card)
3 - software you need - for a simple format or delete from the card - the fastest repair will be with Free Undelete - for a corrupted or complex format (where you perhaps continue taking photos! - arghh done that!) - try Art Plus - Digital Photo Recovery or Recuva
Free Undelete - will go through the file allocation table - and mark deleted files as recovered - quick and simple - if it gets your files back great - that's it.
Art Plus - Digital Photo Recovery - it takes several hours to scan the contents of a large card - depending on the speed etc - it analyzes the disk looking for header information that matches image formats - and reconstructs the images from this.
4 - that's it - store your photos carefully
I hope that helps someone sometime...
Chao