What happens when I reboot an EC2 instance?

Question

When I reboot an EC2 instance, do I get the initial image again, or is the state of the hard disk before the reboot kept?

And what happens with billing, does the hour st

Answer 1

Rebooting keeps the disks intact.

If you shut down the instance and power up a new one, the disks will be reset to their initial states.

This doesn't apply to the EBS disks, which persist even across shutdowns.