Avoid using virtual hard disks with a sector size less than the sector size of the physical storage that stores the virtual hard disk file

Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016

For more information about best practices and scans, see Run Best Practices Analyzer Scans and Manage Scan Results.

Property Details
Windows Server 2016
Product/Feature Hyper-V
Severity Warning
Category Configuration

In the following sections, italics indicates UI text that appears in the Best Practices Analyzer tool for this issue.


One or more virtual hard disks have a physical sector size that is smaller than the physical sector size of the storage on which the virtual hard disk file is located.


Performance problems might occur on the virtual machine or application that use the virtual hard disk. This impacts the following virtual machines:

<list of virtual machines>


Do one of the following:

  • Perform a storage migration to move the virtual hard disk to a new physical system

  • Use Windows PowerShell or WMI to enable a VHDX-format virtual hard disk to report a specific sector size

  • Use a registry setting to enable a VHD-format virtual hard disk to report a physical sector size of 4k