The iPhoto unrecognized format error can create a troublesome situation when you are importing some of your photos to the iPhoto library from any external media drive which can be of mobile, digital camera or the system. The reason why you are facing the error can be the corruption of the image file that you are trying to transfer. The damage in the picture file can occur if the transfer remains incomplete, if the storage is having such issue like it is itself corrupted then you can face the problem. So first you have to repair the memory device in order to fix the iPhoto unrecognized format error. The Some tools may able to fix it but finally you will have to format the drive. Then you can use any of the available backup to restore the corrupted and the deleted photos and you will not face the iPhoto unrecognized format error. However if the backup is not available then you can use the iPhoto recovery software which will scan and detect the photo that require restoration and when you choose them from the preview it will be restored. So download the software now to get your photos back on Mac.