Some SD cards have a tiny switch on the side that make them read-only
- if yours has then maybe you bumped the switch?

On Fri, 26 Jun 2009 16:05:43 -0500, "Danno" <rubyjack@frontiernet.net>
wrote:
[color=blue]
>I have been using an SD card in my laptop for portable storage for ~6
>months. Suddenly, I have started getting an error message saying that "Disk
>is write protected." The tab on the SD card is in the unlock position. I
>have tried using the properties window to change it but their is no option
>to change it from Read Only or Change Permissions. If I click on a folder
>on the SD card and try to change it via the Properties Windows the window
>says that it is "Read Only" but when I uncheck "Read Only," it says I can't
>because the disk is Read Only. And again I can't find any option to change
>ownership or permissions.
>
>
>Thanks in advance,
>Danno[/color]