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Merge pull request #230420 from roygara/fix2Prem2
Clarifying snapshot restrictions
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includes/virtual-machines-disks-incremental-snapshots-restrictions.md

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author: roygara
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ms.service: virtual-machines
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ms.topic: include
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ms.date: 02/17/2023
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ms.date: 03/13/2023
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ms.author: rogarana
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ms.custom: include file
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---
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Incremental snapshots of Premium SSD v2 and Ultra Disks have the following extra restrictions:
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- You must request and receive access to the preview from the following link: [https://aka.ms/UltraPremiumv2SnapshotPreview](https://aka.ms/UltraPremiumv2SnapshotPreview)
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- Currently only available in Sweden Central and US West 3.
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- Snapshots with a 512 logical sector size are stored as VHD, and can be used to create any disk type. Snapshots with a 4096 logical sector size are stored as VHDX and can only be used to create Ultra Disks, they can't be used to create other disk types. To determine which sector size your snapshot is, see [check sector size](#check-sector-size).
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- Incremental snapshots of Ultra Disks are currently only available in Sweden Central and US West 3.
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- Incremental snapshots of Premium SSD v2 disks are currently only available in US East and West Europe.
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- Snapshots with a 512 logical sector size are stored as VHD, and can be used to create any disk type. Snapshots with a 4096 logical sector size are stored as VHDX and can only be used to create Ultra Disks and Premium SSD v2 disks, they can't be used to create other disk types. To determine which sector size your snapshot is, see [check sector size](#check-sector-size).
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- When an incremental snapshot of either a Premium SSD v2 or an Ultra Disk is created, a background copy process for that disk is started. While a background copy is ongoing, you can have up to three total snapshots pending. The process must complete before any more snapshots of that disk can be created.
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- Incremental snapshots of a Premium SSD v2 or an Ultra disk can't be used immediately after they're created. The background copy must complete before you can create a disk from the snapshot. See [Check status of snapshots or disks](#check-status-of-snapshots-or-disks) for details.
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- Disks created from an incremental snapshot of a Premium SSD v2 or an Ultra Disk can't be immediately attached to a VM once it's created. The background copy must complete before it can be attached. See [Check disk creation status](#check-disk-creation-status) for details.

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