Hi Petra,
Dear member of SanDisk Community, welcome.
Cruzer Edge 8GB, is USB 2.0. Link: http://www.sandisk.com/products/usb/drives/cruzer-edge/?capacity=8GB
Well, yes, the Cruzer Edge 8GB has plenty of capacity to store photos.
As depends on the quality of the image, each image weighs different, though have the same characteristics, because all photographic exhibition is based on 3 pillars: diaphragm, speed and sensitivity.
On average (photo 10 Mpx), (roughly…), we have:
RAW Â = Â ~ 22 MB c/u
TIFF Â Â = Â ~ 20 MB c/u
JPEG = Â Â Â ~ 5 MB c/u
Then: con 8 GB= 8000 (8192) MB =>Â RAW Â =Â Â Â 364 fotos
                                                                   TIFF   =   400 fotos
                                                                   JPEG  = 1600 fotos
For certainty, you can see in the camera manual.
Enjoy!
Regards, Alfred. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (Google translated)