Force detach of zone redundant disks allows the disks to be available for use when there is a zone outage. The ZRS disks can be detach from the VM on the impacted zone and attached to a new VM in the active zone for business continuity. This allows customers to take advantage of the ZRS ability to provide an RPO of 0. Zone redundant storage (ZRS) option for Azure managed disks is supported on Premium SSDs and Standard SSDs.
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To learn more about ZRS disks