If you want to detach the system disk from an instance, the instance needs to be in the "Stopped" status.
The cloud disk is attached to the instance as a data disk by default. The detailed steps are as follows:
In addition, you can also perform detaching operation from the cloud disk console. Refer to Cloud Disk Side Detaching for detailed steps.
The attaching state of the cloud disk in the tab page will be changed into "Detaching". It takes some time to detach the cloud disk. Please wait patiently and refresh the page. After the detaching succeeds, the attaching state will be changed into "Detached". This state will remain for 15 minutes and the cloud disk under this state does not occupy the number of attached disks of the instance.