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Clarifying limitations.
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includes/disks-prem-v2-limitations.md

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- Azure Disk Encryption (guest VM encryption via Bitlocker/DM-Crypt) isn't supported for VMs with Premium SSD v2 disks. We recommend you to use encryption at rest with platform-managed or customer-managed keys, which is supported for Premium SSD v2.
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- Currently, Premium SSD v2 disks can't be attached to VMs in Availability Sets.
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- Azure Backup and Azure Site Recovery aren't supported for VMs with Premium SSD v2 disks.
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- The size of a Premium SSD v2 can't be increased without deallocating the VM or detaching the disk.
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- The size of a Premium SSD v2 can't be expanded without either deallocating the VM or detaching the disk.

includes/managed-disks-ultra-disks-GA-scope-and-limitations.md

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Ultra disks can't be used as OS disks, they can only be created as empty data disks. Ultra disks also can't be used with some features and functionality, including disk export, changing disk type, VM images, availability sets, or Azure disk encryption. The size of an Ultra Disk can't be increased without deallocating the VM or detaching the disk. Azure Backup and Azure Site Recovery do not support ultra disks. In addition, only un-cached reads and un-cached writes are supported. Currently, snapshots for ultra disks are available as a public preview and only in Sweden Central and US West 3, they aren't available in any other region.
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Ultra disks can't be used as OS disks, they can only be created as empty data disks. Ultra disks also can't be used with some features and functionality, including disk export, changing disk type, VM images, availability sets, or Azure disk encryption. The size of an Ultra Disk can't be expanded without either deallocating the VM or detaching the disk. Azure Backup and Azure Site Recovery do not support ultra disks. In addition, only un-cached reads and un-cached writes are supported. Currently, snapshots for ultra disks are available as a public preview and only in Sweden Central and US West 3, they aren't available in any other region.
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Ultra disks support a 4k physical sector size by default. A 512E sector size is available as a generally available offering with no sign-up required. While most applications are compatible with 4k sector sizes, some require 512 byte sector sizes. Oracle Database, for example, requires release 12.2 or later in order to support 4k native disks. For older versions of Oracle DB, 512 byte sector size is required.
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includes/virtual-machines-disks-shared-limitations.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: 09/29/2022
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ms.date: 03/27/2023
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ms.author: rogarana
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### General limitations
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Enabling shared disks is only available to a subset of disk types. Currently only ultra disks, premium SSD v2 managed disks, premium SSD managed disks, and standard SSDs can enable shared disks. Shared disks can be attached to individual Virtual Machine Scale Sets but can't be defined in the Virtual Machine Scale Set models or automatically deployed.
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Enabling shared disks is only available to a subset of disk types. Currently only ultra disks, premium SSD v2 managed disks, premium SSD managed disks, and standard SSDs can enable shared disks. Shared disks can be attached to individual Virtual Machine Scale Sets but can't be defined in the Virtual Machine Scale Set models or automatically deployed. A shared disk can't be expanded without either deallocating the VM or detaching the disk.
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> [!IMPORTANT]
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> Host caching isn't supported for shared disks.

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