Attaching the Volume to an instance problem regarding some devices.

While it can vary by instance type, in general /dev/sdb thru /dev/sde are for instance store volumes only - see the Linux section of https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/device_naming.html

To attach EBS volumes, start at /dev/sdf

Hey,

When you try to attach a volume through AWS console, after choosing the instance , you will see a drop down populated with list of device names available in that instance.

It's not necessary that you should start from "sdf". But it's recommended.

"Device already in use" of "Invalid device name" usually occurs when that device name is being marked as used by the VM (OS). You can also verify the device name availability from OS using lsblk command (Linux instances), or the Disk Management utility or the diskpart command (Windows instances).