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Merge pull request #114817 from msmbaldwin/ade
Clarified SSE / temp disks
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includes/virtual-machines-managed-disks-overview.md

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### Server-side encryption
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[Azure Server-side Encryption](../articles/virtual-machines/windows/disk-encryption.md) provides encryption-at-rest and safeguards your data to meet your organizational security and compliance commitments. Server-side encryption is enabled by default for all managed disks, snapshots, and images in all the regions where managed disks are available. You can either allow Azure to manage your keys for you, these are platform-managed keys, or you can manage the keys yourself, these are customer-managed keys. Visit the [Managed Disks FAQ page](../articles/virtual-machines/windows/faq-for-disks.md#managed-disks-and-storage-service-encryption) for more details.
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[Azure Server-side Encryption](../articles/virtual-machines/windows/disk-encryption.md) provides encryption-at-rest and safeguards your data to meet your organizational security and compliance commitments. Server-side encryption is enabled by default for all managed disks, snapshots, and images, in all the regions where managed disks are available. (Temporary disks, on the other hand, are not encrypted by Storage Service Encryption; see [Disk Roles: temporary disks](#temporary-disk)).
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You can either allow Azure to manage your keys for you, these are platform-managed keys, or you can manage the keys yourself, these are customer-managed keys. Visit the [Managed Disks FAQ page](../articles/virtual-machines/windows/faq-for-disks.md#managed-disks-and-storage-service-encryption) for more details.
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### Azure Disk Encryption
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Azure Disk Encryption allows you to encrypt the OS and Data disks used by an IaaS Virtual Machine. This encryption includes managed disks. For Windows, the drives are encrypted using industry-standard BitLocker encryption technology. For Linux, the disks are encrypted using the DM-Crypt technology. The encryption process is integrated with Azure Key Vault to allow you to control and manage the disk encryption keys. For more information, see [Azure Disk Encryption for IaaS VMs](../articles/security/azure-security-disk-encryption-overview.md).
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Azure Disk Encryption allows you to encrypt the OS and Data disks used by an IaaS Virtual Machine. This encryption includes managed disks. For Windows, the drives are encrypted using industry-standard BitLocker encryption technology. For Linux, the disks are encrypted using the DM-Crypt technology. The encryption process is integrated with Azure Key Vault to allow you to control and manage the disk encryption keys. For more information, see [Azure Disk Encryption for Linux VMs](../articles/virtual-machines/linux/disk-encryption-overview.md) or [Azure Disk Encryption for Windows VMs](../articles/virtual-machines/windows/disk-encryption-overview.md).
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## Disk roles
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### Temporary disk
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Every VM contains 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](../articles/virtual-machines/windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json#understand-vm-reboots---maintenance-vs-downtime) event or when you [redeploy a VM](../articles/virtual-machines/troubleshooting/redeploy-to-new-node-windows.md?toc=%2Fazure%2Fvirtual-machines%2Fwindows%2Ftoc.json). On Azure Linux VMs, the temporary disk is /dev/sdb by default and on Windows VMs the temporary disk is D: by default. During a successful standard reboot of the VM, the data on the temporary disk will persist.
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Every VM contains 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](../articles/virtual-machines/windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json#understand-vm-reboots---maintenance-vs-downtime) event or when you [redeploy a VM](../articles/virtual-machines/troubleshooting/redeploy-to-new-node-windows.md?toc=%2Fazure%2Fvirtual-machines%2Fwindows%2Ftoc.json). During a successful standard reboot of the VM, the data on the temporary disk will persist.
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On Azure Linux VMs, the temporary disk is /dev/sdb by default and on Windows VMs the temporary disk is D: by default. The temporary disk is not encrypted by Server Side Encryption (see [Encryption](#encryption)).
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## Managed disk snapshots
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