My external hard drive can be read from but not written to. This is not the first time this problem has appeared. It started a few weeks ago. Sometimes it worked, sometimes not. If I unplug it, then plug it in again, then scan for errors it worked again. Then the problem started to appear more often and sometimes even scanning didn't work. At the end I could do nothing, so I was forced to copy the data and format the hard drive.
It worked for a few days, but now the problems start again. Same thing happened to an other hard drive (same model) of mine, but now that one seems to be OK.
What is this? A virus? What can cause a hard disc to not be writable? What can be the reason that this appears again? Is it possible that these are just bad hard drives (they are a cheap trekstor model)?
My feeling is that it is related to my specific computer. On my laptop, the same thing appears, but not that often.