This usually happens when the starter drive goes bad or if the flywheel has been damaged by the starter or previous starter failure. When you pull the starter to have a look, turn the flywheel and check all the teeth on it before replacing the starter.
Check if muffler is loose, check if rear brakes are worn out & grinding
you probably need a new set of break pads. they have most likely worn down to the metal so that'd be why its grinding
The grinding sound means that the brake pads are worn down to metal and that sound you hear is metal to metal. you need to have the pads changed, the problem is that you will more than likely have to change the rotors also. The way to avoid this in the future is when you notice your brakes are making a squealing sound that means that the pads will need to be changed soon.
A grinding noise when braking can occur when the brake pads are going bad. You are hearing the brake grinding on the metal discs.
Most of Saturn is hydrogen and helium, but it probably has a core composed of rock and metal.
filings
swarf
By grinding or filing the metal.
When grinding metal you should wear eye protection. A mask to filter metal particles from the air you breath may be appropriate if you are doing work that will release very small metal particles, and if the metal is chemically hazardous.
Check the brake pads on that wheel, it sounds like you have metal on metal if the grinding is only when you are stoping or right after you release the brake and start rolling
A bad transmission. The sound is from metal grinding on eachother.
try checking your engine for loose things