do a

git reset --hard origin/master

the post above has some merit..

"... I immediately clicked "verify only" and got the error "Verification failed at sector: 8192".
Then I tried the following:
READ the contents of the SD card back to a file TEST.IMG.
WRITE the file TEST.IMG back to the SD card.
Run "verify only".
This time, the verify succeeded without any errors."

I performed the same steps and got the same outcome.
It took 3-4x as long this time to read,write, verify the image.
Some of the NES Roms now play, still working on it
Thanks again for everyones help :)

Thank you @BuZz. It help installing from source. I does not know why the Libretro i slow, mabye i have change something.
It solved the problem thanks

@Haemogoblin Glad I could help. On the subject of Moon Patrol, I assume you have played Horizon. Also from IREM, released in 1985. It's a sequel really. Basically the same idea but you can move between 3 horizontal planes as your vehicle travels along. If you haven't tried it I highly recommend it.