There are couple of storage options available to you when you make use of EC2. The first one is an instance storage and the other one is the Elastic Block Storage.
Storage options on EC2
Instance storage
Instance storage comes with the host computer and is physically attached to the host computer. Instance storage comes with SSD and HDD offerings. The data on instance store is ephemeral in nature. This is also called a non-persistent data store. The amount of storage and the type that you get is totally dependent on the instance type. The data on the instance store is dependent upon the instance lifecycle. The instance store data persists only when the operating system in the EC2 instance is rebooted or the instance is restarted...