NEVER connect a camera to your computer. Use a card reader.
This excerpt is from a long-gone post by the late, lamented author Bruce Fraser:
Bruce Fraser - 4:17pm Jun 14, 04 PST (#5 of 21)Opening files directly from the camera is a bad idea for a variety of reasons*, and it most certainly isn't faster than using a FireWire or USB2 card reader.
•
• Drains the camera battery
• Runs the risk of the software you're using to open the images writing to the card and destroying the format
• Runs a small but significant risk of USB power frying the camera
• Slowest method known to mankind of getting images off a CF or SD card