Billing Overview
The system disk and snapshot's Charging Rule/Billing item/Billing method/price configuration would be described with ECS instance.
This overview describes the billing item and billing methods of Block storage.
For subscription billing method, the system doesn't support purchases separately ,the user can only purchase it attaching to a subscription ECS instance.
The system support purchasing the subscription EBS and attaching to subscription ECS instance together.
The system support purchasing the Pay-As-You-Go EBS separately, and attaching to subscription ECS or Pay-As-You-Go ECS after purchase.