File system is suddenly read only?

[Wurstbrot24]

Hi guys.

I'm using the official raspbian wheezy image (kernel version 3.18) on my Raspberry Pi model B. I set everything up and now run it as a headless server and SSH into the machine to do stuff. Everything ran just fine for about a week, but now I have problems. I didn't change anything inbetween.

I now get error messages on practically everything but navigating through the folder structures. From my understanding I can't do anything that requires writing to the file system. I can't create folders, can't edit files, can't even reboot or run apt-get. For the first two, I get the error message "read-only file system". I checked for the ro flag in /etc/fstab, but there is none.

I've had the exact same problem before, which I "resolved" by pulling the cord. However, the raspberry pi wouldn't boot afterwards and I had to set everything up again. I'd like to avoid doing this on a weekly basis.

Any ideas?

[DougieLawson]

You'll need to use another Linux system to fsck your broken filesystem.

Easiest way to do that is with another microSD booted in your RPi and the broken microSD mounted in a USB SDCard reader.

[fruit-uk]

Or it may have done a Sandisk and gone read-only (ie. dead) 'for the protection of your data' (or a very similar phrase to that)