I found a bug in the firmware on the Sony DSC-T1 camera, produced in 2003. When the internal four-digit image counter rolls over the 10,000 mark, it starts over twice: once after rolling over, and again after the first time you format the memory card. The sequence goes like this:
- 9998
- 9999
- 0001
- 0002
- reformat card
- 0001 <-- oops
It also infuriatingly restarts at 0001 (not 0000) so my total count gets screwy. I suppose the counter bug could be used to correct for that, though.

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