Elastic Block

EBS starts out really simple: you create a volume from 1GB to 1TB in size and then you mount it on a device (like /dev/sdj) on an instance, format it, and off you go. Later you can detach it, let it sit for a while, and then reattach it to a different instance.
…
Store brings cloud computing to a whole new level. I’ll repeat what I’ve said before: if you’re using traditional forms of hosting it’s gonna get pretty darn hard for you to keep up with the cloud, and you’ve probably already fallen behind at this point!

Das RightScale Blog zu Amazon’s neuem Cloud-Speicherdienst Elastic Block Store