https://community.usa.canon.com/t5/Point-Shoot-Digital-Cameras/Have-PowerShot-A720IS-Unable-to-erase-and-format-4GB-PNY-SD-card/m-p/44979#M3791 <P>That may be caused by the "write protect" tab being set to the back of it's slot. Remove the card from the camera &amp; you'll see the little tab on the side of the card near the terminal end, &amp; see if you can slide it forward until it stops. It could also be that the tab has broken off or fallen out of the card (I've got 2 with that problem).</P><P>&nbsp;</P> Sat, 19 Oct 2013 23:45:41 GMT cicopo 2013-10-19T23:45:41Z https://community.usa.canon.com/t5/Point-Shoot-Digital-Cameras/Have-PowerShot-A720IS-Unable-to-erase-and-format-4GB-PNY-SD-card/m-p/44975#M3790 Sat, 19 Oct 2013 22:21:15 GMT https://community.usa.canon.com/t5/Point-Shoot-Digital-Cameras/Have-PowerShot-A720IS-Unable-to-erase-and-format-4GB-PNY-SD-card/m-p/44975#M3790 EAJ 2013-10-19T22:21:15Z https://community.usa.canon.com/t5/Point-Shoot-Digital-Cameras/Have-PowerShot-A720IS-Unable-to-erase-and-format-4GB-PNY-SD-card/m-p/44979#M3791 <P>That may be caused by the "write protect" tab being set to the back of it's slot. Remove the card from the camera &amp; you'll see the little tab on the side of the card near the terminal end, &amp; see if you can slide it forward until it stops. It could also be that the tab has broken off or fallen out of the card (I've got 2 with that problem).</P><P>&nbsp;</P> Sat, 19 Oct 2013 23:45:41 GMT https://community.usa.canon.com/t5/Point-Shoot-Digital-Cameras/Have-PowerShot-A720IS-Unable-to-erase-and-format-4GB-PNY-SD-card/m-p/44979#M3791 cicopo 2013-10-19T23:45:41Z