I copied a bunch of images onto and SD card (on my Mac), then used the SD card in a digital photo frame. I wanted to add some more pictures and received and error that the volume was read only. I am running a Power Book OS Version 10.6.5. The card is not locked. Here is everything I have tried so far - nothing below has worked: I have tried the following: Disk Utility - Restore button was greyed out. Then I tried the following commands: sudo chmod -RN /Volumes/.... I received the following error messages (one per file in the volume): chmod: Failed to clear ACL on file IMG_0010.jpg: Read-only file system I then tried sudo chown -R USERNAME /Volumes/.... I received the following error messages (one per file in the volume): chown: /volumes/Untitled/IMG_0011.jpg: Read-only file system It is an SD card where I put a bunch of images onto it for a digital picture frame. After putting it in the frame I wanted to add files to the SD card and this is what I get. No, the SD card is not locked. Any ideas???