AWS SDK for .NET Documentation
RamdiskId Property
AmazonAmazon.EC2.ModelRegisterImageRequestRamdiskId Did this page help you?   Yes   No    Tell us about it...
The ID of the RAM disk to select.
Declaration Syntax
C#
public string RamdiskId { get; set; }
Remarks
Some kernels require additional drivers at launch. Check the kernel requirements for information on whether you need to specify a RAM disk.

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)