I am running a RPi2. It has all been working just fine. Today I took the update and its seems to have lost the HDD. Not sure what to do. I tried a USB drive to see if it was an issue with my externally power USB drive. It couldnt see that either.
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Assuming the commands were run then it’s likely that the SD card has failed and gone read only.
Often when SD cards fail they go into a kind of “read only” mode where it is impossible to write changes. If you create or modify a file the operating system will believe that the change was made (you won’t get an error saying it failed to write) but next time the file is read the original contents are still there.
Or if you create a file then reboot the file will be gone.
Coincidentally I’ve had two 8GB SD cards about 2 years old fail on me within a couple of weeks in exactly this way - one minute it is working fine, the next minute it is read only. That makes 3 cards now that I’ve had fail on me.
The way to test this theory is you need to make a configuration change or copy a file onto the SD card then reboot and see if the file is there - if it disappears and no changes that you make persist across a reboot your SD card has failed.