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:
3. In the output you will find the value for "Bytes Per Physical Sector", which can be one of the following:
An update that improves the compatibility of Windows 7 and Windows Server 2008 R2 with Advanced Format Disks is available, see the following article.