Sony DSLR-A850 - Manual (Page 160)

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Your computer does not recognize your camera.
• Use the USB cable (supplied) (page 136).
• Disconnect the USB cable, and connect it again firmly.
• Set [USB connection] to [Mass Storage] (page 136).
• Disconnect all equipment other than the camera, the keyboard and the
mouse from the USB jacks of your computer.
You cannot copy images.
• When you are copying images from the camera to your computer, if you
open the memory card cover, the copy is canceled. Do not open the memory
card cover during copying.
• When you shoot images with a memory card formatted by a computer, you
may not be able to copy the images to a computer. Shoot using a memory
card formatted by your camera (page 120).
Cannot insert a memory card.
• Insertion direction of the memory card is wrong. Insert it in the correct
direction (page 23).
Cannot record on a memory card.
• The memory card is full. Delete unnecessary images (page 97).
• An unusable memory card is inserted (page 23).
You have formatted a memory card by mistake.
• All the data on the memory card is deleted by formatting. You cannot
restore it.
Computers
Memory card