We are excited to introduce a new property for Disks in the Azure Portal, PowerShell (PS), and Command-Line Interface (CLI). This property, LastOwnershipUpdateTime, reflects the time when the Disk’s state was last changed. This property can be used in conjunction with the diskState to identify the current state of the Disk, and when it was last updated.
To use this property to identify and delete unattached disks, read the documentation.