These tools rescue JPEG files from broken SD/USB memory cards 

* jpeg_rescue

'jpeg_rescue' rescues JPEG files from broken SD/USB memory cards.
This tool expects JPEG files are wrote sequentially in memory device.

This tool searches JPEG Start Of Image (0xff 0xd8) from top of
each cluster (4KB block) and pick up data (to just before next SOI).

usage: 

1. insert broekn SD/USB memory into slot of your PC.
2. when your memory device appears in /dev/da0
 # dd if=/dev/da0 of=hogehoge bs=1m
 # jpeg_rescue hogehoge
 or
 # jpeg_rescue /dev/da0


* jpeg_truncate
'jpeg_truncate' truncates unnecessary end of data
This tool trancate garbage after JPEG End Of Image (0xff 0xd9)

usage:
 % jpeg_truncate *.jpg