> For the complete documentation index, see [llms.txt](https://karansingh.gitbook.io/aws-saa-c02/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://karansingh.gitbook.io/aws-saa-c02/ec2-storage-ebs-efs-instance-store/efs-vs-ebs.md).

# EFS vs EBS

* **EBS Volumes - Availability Zone**

  * Amazon **EBS volume is tied to its Availability Zone**.
  * It **can only be attached to instances in the same Availability Zone**.

* **EBS Snapshot - Regional**
  * An **EBS snapshot is tied to its region**.
  * It **can only be used to create volumes in the same region** and has to be copied from one region to other if you need to create a volume in a another region.<br>

* **EFS Volume - Regional**

  * An **EFS volume can be mounted to hundreds of EC2 instances** across **multiple different availability zones**.

* **By default, Amazon EBS root device volumes are automatically deleted when the instance terminates**.
  * However, by default, **any additional EBS volumes that you attach at launch, or any EBS volumes that you attach to an existing instance persist even after the instance terminates**.<br>

* **EFS is more expensive than EBS**.