After you attach an Amazon EBS volume to your instance, it is exposed as a block device. You can format the volume with any file system and then mount it. After you make the EBS volume available for use, you can access it in the same ways that you access any other volume. Any data written to this file system is written to the EBS volume and is transparent to applications using the device.
Note that you can take snapshots of your EBS volume for backup purposes or to use as a baseline when you create another volume. For more information, see Amazon EBS Snapshots.
Use the following procedure to make the volume available. Note that you can get directions for volumes on a Windows instance from Making the Volume Available on Windows in the Amazon EC2 User Guide for Microsoft Windows Instances.