To attach Amazon EBS to multiple machine instances, open the Amazon EC2 console. Click “Volumes” then select to attach volumes. Enter the name of the instance into the “Instance” box. Click “Attach” to attach the volume to the instance. The Amazon EC2 does not place any limitations on how many volumes can be attached to an instance. If you need to attach Amazon EBS to more than 40 machine instances, you may want to consider using Linux due to the risk of boot failure in Windows.