AWS SDK for .NET Documentation
VolumeType Property
AmazonAmazon.EC2.ModelVolumeVolumeType Did this page help you?   Yes   No    Tell us about it...
The volume type. This can be gp2 for General Purpose (SSD) volumes, io1 for Provisioned IOPS (SSD) volumes, or standard for Magnetic volumes.

Constraints:

Allowed Values
standard, io1, gp2

Declaration Syntax
C#
public string VolumeType { get; set; }

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