Comment 1 for bug 1100228

I am unable to reproduce this here. Using a sample image I have, I am able to mark it as read-only, and it will still write. Clicking on read will cause an error, though.

Remember, read is for reading a device and saving to an image file, write is to write an image file to a device.

If you still experience a problem, can you please let me know what version you are running, and what version of Windows? Also, if running on Windows Vista/7/8, you need to run this as administrator.