New
#11
Given the previous history and the fact that with the drive connected you are not able to even boot now, I would think the drive is failing fast.
The most logical thing to do now is to retrieve as much data as possible. In fact you must have done it at the first opportunity when Lucid Puppy could access the three partitions without any problems and the fourth partition as read only. Do it now before it becomes never ever. Till such time do not use your computer OR disconnect the 1TB problem drive by plugging out the power cable and data cable and use your computer with only the system drive connected.
At the moment I am not sure if you can copy the read only files. If you cannot copy the read only files as such, try to save those with a different file name - for example dude.jpg as dudeA.jpg.
Meanwhile I have sent a PM to Anshad Edavana to have a look at this thread for his expert handling and opinions. He definitely has a better head than me. :)