1. write down the instance ID, AMI ID, & Availability zone of the original instance
In the root device field, take note of the device name for the root volume(for example /dev/sda1 or /dev/xvda).
choose the link & write down the volume ID in the EBS ID field(vol -XXXXXXXXX)
create an instance with same AMI
2.deattach the storage from original one and attached with new one