I have two 4TB WD RED HDDs in a machine running Ubuntu 14.04. One drive is perfectly normal, but the other one does not allow writes. The error says
Read-only file system (30) in Midnight Commander.
I tried replacing it with another identical WD RED HDD, but it still started giving the same error after a few successful writes.
I also tried formatting the drive with NTFS and using it under Windows. It did not seem to have any problem, allowing me to write 2.5TB of file onto it.
The drive in question has one primary ext4 partition.
Is something wrong with the drive's hardware? Or is it something else? Any ideas will be appreciated.