Most VMs contain a temporary disk, which is not a managed disk. The temporary disk provides short-term storage for applications and processes, and is intended to only store data such as page or swap files. Data on the temporary disk may be lost during a [maintenance event](./understand-vm-reboots.md) or when you [redeploy a VM](/troubleshoot/azure/virtual-machines/redeploy-to-new-node-windows?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json). During a successful standard reboot of the VM, data on the temporary disk will persist. For more information about VMs without temporary disks, see [Azure VM sizes with no local temporary disk](azure-vms-no-temp-disk.yml).
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