Dual Hard-drive, second hard-drive cannot repair disk, read-only

[mojohojo]

Hi guys,

Few months back, I swapped out my optical-drive bay with a secondary hard-drive for additional storage. Bought a new SSD for my main hard disk, and moved my previous HDD to the optical-drive with the relevant adapters.
All seem to work fine; but just few days ago I get a message 'macOS can't repair the disk "Macintosh HD"; and its become read-only right now.
I also installed Paragon NTFS for Mac driver that came with my external WD hard-drive to read the NTFS external drive.
So Im not sure if this is the cause or not, because my HDD is a mac Journaled HFS Plus volume.

Could there be some loose wiring inside?

 

[mojohojo]

should i take this to an apple authorised service? would they be able to identify if I have changed out my optical drive myself?

 

[Fishrrman]

"should i take this to an apple authorised service? would they be able to identify if I have changed out my optical drive myself?"

Of course they would.
They might not be willing to touch it, because of the changed configuration.

I suggest you completely disable and REMOVE the Paragon software, then try again.