This topic describes the categories and information of disks supported by ECS.

Category Code Maximum capacity of a single disk (GiB) Volume limit per instance Maximum capacity of a single disk allowed per instance (GiB)
Basic disk cloud 2000 17 2000 * 17
Ultra disk cloud_efficiency 32768 17 32768 * 17
Standard SSD cloud_ssd 32768 17 32768 * 17
Enhanced SSD (ESSD) cloud_essd 32768 17 32768 * 17

For more information about disk performance, see EBS performance.