Sony VAIO VGN-P500 Series User Manual page 157

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Troubleshooting
Can I copy images from a digital camera using a Memory Stick?
Yes, and you can view video clips that you have recorded with Memory Stick-compatible digital cameras.
Why can't I write data to a Memory Stick?
Some versions of the Memory Stick are equipped with an erasure prevention switch to protect data from accidental erasure
or overwriting. Make sure the erasure prevention switch is off.