I tried Azure ephemeral OS Disk

Japanese page is HERE I tried Azure Ephemeral OS Disk on General Availability at July 1, 2019. https://azure.microsoft.com/en-us/updates/azure-ephemeral-os-disk-now-generally-available/ A technology that mounts an OS disk on the cache area in the server where the virtual machine is hosted without using the Managed Disk or Storage Account vhd file for the OS disk of the IaaS virtual machine. The OS disk is not persisted, but a managed disk can be used as an additional data disk.