What Are the Restrictions on Attaching a Disk to an ECS?

The disk and the target ECS must be located in the same AZ.
The target ECS must be in Running or Stopped state.
A frozen disk cannot be attached to an ECS.
For ECSs charged in yearly/monthly mode:
If you detach the system disk purchased when you buy an ECS and want to continue using it as a system disk, you can only attach it to an ECS that has the same specifications as those of the original ECS. If you want to use it as a data disk, you can attach it to any ECS.

If you detach the non-shared data disk purchased when you create an ECS and want to attach it again, you can only attach it to the original ECS as a data disk.

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