How do you shutdown Rsync?

Does anyone know how to shutdown rsync. A PS -A shows that it is running. When I try to RO my drive it tells me it is busy.

For anyone else that is trying to figure this stuff out heres the answer:

type ps -A and find the PID number for rsync.

now just type kill "PID Number"

The command is 'kill'. It takes a process ID (PID). ps lists it.

Edit: Beaten to it, doh!