External Hard Drive Read Only. Please Help!

So I have looked for answers and I can't find one. I need help ASAP cause I have to edit pictures and I have no space.
Ive read that I have to format my ED but it was working just fine. I don't want to erase none of the backups in there. Theres about 900GB already used.

Looks like your HD is full. When something is full, the only way to make room is to delete stuff.
  Formatting will wipe it clean by removing everything in it.
For alternatives, go into the HD and delete stuff selectively you no longer need to make room.
The only other option is to buy a new HD.
With that said, I see no indication the drive is failing. Only that it is full.  Unless you know for a fact there should not be enough data in it to have only 88GB left. I don't see anything overtly wrong with it.

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