Power shot A460
You can use camera recovery software like asoftech photo recovery, you can download from
Camera photo recovery program
You may refer to this tutorial
Recover photos from digital camera
SOURCE: canon power shot sx 100 reads card locked
SD Memory cards have a tiny switch on the edge that marks the memory card as read only and prevents any writes. If you get the message "Card locked!" when you turn the camera on then turn the camera off, eject the SD card. With the card facing you (metal contacts facing away) the switch is on the left hand edge, slide towards the top of the card to make the card read/write again.
SOURCE: New San Disk memory card not working
vebhat,
Make sure the little slide on the SD card is in the right position, and if it's a high capacity SD it might not be compatible with your camera...
randy320sgi
SOURCE: memory card capacity for my older canon digital camera
Does you camera use CF cards?
If so the may work but some of the newer high tech CF cards are made for newer cameras.
It may be worth a shot to try the 2GB card and if it does not work, sell to someone who uses those.
SOURCE: when i insert 4gb memory card into canon power
Your new 4GB memory card is the problem. The card would likely be an SDHC card (look on its front cover). Your A540 camera was designed well before the SDHC format came out, and your camera will not recognize it. Your camera can only use standard SD cards (2GB or less). Here's some from Amazon.
SOURCE: I have a cannon power shot SD600. I bought a
Did you get an SDHC card? The SDHC protocol was developed after the SD600 came out, and the SD600 is not compatible with it. Use SD cards with a maximum of 2GB storage capacity.
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