This article describes how to check if a hard drive is an Advanced Format (AF) disk or legacy 512 native in computers with Windows 7 or Windows Server 2008 R2 installed.
1. Open a command prompt (Start > Run > cmd)
2. Enter the command:
fsutil fsinfo ntfsinfo <drive letter>:
3. In the output you will find the value for "Bytes Per Physical Sector", which can be one of the following:
512 - for Legacy 512 native drives
4096 - for Advanced Format (AF) drives
<Not Supported> - if the hardware or driver does not support the IOCTL_STORAGE_QUERY_PROPERTY control code
An update that improves the compatibility of Windows 7 and Windows Server 2008 R2 with Advanced Format Disks is available, see the following article.
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