ec2 ami device mapping

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http://serverfault.com – I have large ec2 Ubuntu image and I'm just looking through the devices. I noticed from the metadata that % curl sda1 % curl sdb However when I look what is actually mounted there is /dev/xvda1 and /dev/xvdb (and there is no /dev/sd* ) I know that both names look somewhat valid from the AWS documentation, but it looks to me from this like there is a mismatch in the instance metadata and what is actually on the machine. Why don't they match? (HowTos)