public Boolean isNoDevice() {
        return this.noDevice;
    }
<p>
Setting this value to <code>true</code> prevents a volume that is included in the block device mapping of the AMI
from being mapped to the specified device name at launch.
</p>
<p>
If <code>NoDevice</code> is <code>true</code> for the root device, instances might fail the EC2 health check. In
that case, Amazon EC2 Auto Scaling launches replacement instances.
</p>

@return Setting this value to <code>true</code> prevents a volume that is included in the block device mapping of
        the AMI from being mapped to the specified device name at launch.</p>
        <p>
        If <code>NoDevice</code> is <code>true</code> for the root device, instances might fail the EC2 health
        check. In that case, Amazon EC2 Auto Scaling launches replacement instances.
aws-java-sdk-autoscaling/src/main/java/com/amazonaws/services/autoscaling/model/BlockDeviceMapping.java