My digital cam takes SD cards. When I first got it I KNOW for a fact I was able to shoot some pics, pop the card in the reader, transfer my pics, then delete the pics off the card while it was still in the card reader. The cam came with a measley 16mb card so I bought a couple 512mb cards. I KNOW for a fact the first time or two I took pics on the 512 card it worked the same way. Took pics, put card in reader, transfer, drag all pics from card to trash and delete, thereby emptying the card. Well somewhere along the way the card has become "read only" when in the card reader. I can transfer the pics but I cant delete them while the card is in the card reader. I have to put the card back into the camera and format the card in camera to empty it (canon powershot cam). So today I dug out the 16mb card it came with to see something. Put the card in the cam, took a few pics, put card in card reader, transferred pics, dragged pics from card to trash and deleted. It worked! At this point I figured it must be something with the other cards I had. So I swapped them in and out a few times, and then I noticed something. On the 16mb card it TOO IS NOW READ ONLY!!!! Says I do not hav sufficient priviledges to delete the card. Now how in the world did it go from me being able to do it 3 minutes ago to basically locking me out of the card? Is there ANY way around this??? Its really really annoying me. Hope this is clear enough for you to understand.