Instance store volumes are high performance local disks that are physically attached to the host computer on which an AWS EC2 instance runs.
Instance stores are ephemeral which means the data is lost when powered off (non-persistent).
Instances stores are ideal for temporary storage of information that changes frequently, such as buffers, caches, or scratch data.
Instance store volume root devices are created from Amazon Machine Image (AMI) templates stored on Amazon Simple Storage Service (S3).
Instance store volumes cannot be detached/reattached.