Easiest way is to use Windows dispart in the command prompt window.
Open the command prompt box with right click and run as administrator
Type each of these commands one at a time in this order:
select volume n (where n = the problem volume)
attributes disk clear readonly
attributes volume clear readonly
After each of the last two you should get a response that it was successful.
Your drive should now be both read and write capable.
I have a serious problem that I'd love if someone could help me with. Plugging my external hard drive into my work laptop showed it as write protected. I'm not sure why but I needed to get rid of this to back up some important data. The above advice looked pretty harmless and also appeared to work. The big problem now is- when I plug the drive into the laptop it shows up as not being formatted. There is 1.5TB of data on the drive I don't want to lose, it would take me quite a while to get that all back, some of it I cannot. Does anyone have any idea how I can recover the situation? Either by reversing what was done, or by manually putting into the command prompt the format for the disk?
Any help would be greatly appreciated.