Upload & Sell: Off
You can do the 'format trick' on a 4gb card…this will allow the 1D to shoot upto the 4gb capacity (more like 3.75gb in real world) even though the camera will show it as a 2gb card.
Is the formatting trick a secret
You format your 4 gig CF in your computer as FAT,,, instead of FAT32.
I could not do it with my XP machine, but Win 7 was not a problem.
Never had Vista.
**** You can NOT format in the camera. The camera will only see 2 gig if you do.