EBS volumes are network derives with good performance; however, if you need a high-performance hardware disk, EC2 Instance Store is your choice. EC2 Instance Store is a physical hard drive attacked to the sever instead of the network attached EBS, which provides better I/O performance.
Ephemeral storage
A caveat is EC2 instance store is an ephemeral storage that will lose its storage when your EC2 instance is terminated. Therefore, it is not suitable for long-term storage of data, but for buffer / cache / scratch data / temporary content. Because of the risk of losing data, you are encouraged to backup and replicate your data in a regular basis.
Back to parent node: EBS - Elastic Block Store
Cloud_computingAWSAWS_CLF-C02AWS_storageEC2EC2_instance_store
Reference - EC2 Instance Store