I have a Sandisk Cruzer Blade pen drive of capacity 16 GB. I had some data in it which is not so important so I wanted to format it. I wanted complete space to store some large amount of data. As soon as I clicked on format button, it gave me an error message saying that this device is write protected and it cannot be formatted. I am using Windows XP in which I am trying. Is there any way I can remove this error. I scanned my pen drive with anti-virus software, but no virus was found. Why is it happening, Can anybody tell me how to format pen-drive now?