I would expect around 90% of the subformats of Jpegs can be seen partially completed, as I have experianced it many times before when looking at an image using http when I have only uploaded half of it to my ftp server.
When you have 600kb of a 700kb then retrieving it is worthwhile, sure you may have about a quater of an inch of grey where the file has cut off, but since when is anything important in the bottom of the picture?
Jpegs are built so they work in blocks, left to right, top to bottom, meaning the top left of the picture is at the start of the file, bottom right is at the end of the file. Unlike most Gif files that are built in a sort of matrix format.
Retrieving the files is the main thing to me, if I can retrieve them then I can repair them.
