Temporary disks use a solid-state drive that is located on the same Azure host as the virtual machine. This temporary storage is typically used to save the system paging file, but can be used to store other data that you can afford to lose. There is no extra storage associated with this temporary storage.

Temporary disks are high performance, and can be used for operations such as temporary data processing. However, if the virtual machine is moved to a new host, then the data stored on the temporary disk will be removed. The size of a temporary disk is generally determined by the virtual machine size, and they are typically assigned a drive letter of D: by default.