Article ID: 982018 - View products that this article applies to.
This article describes an update that improves the compatibility of Windows 7 and Windows Server 2008 R2 with Advanced Format Disks that have a 4KB physical sector size. This hotfix is only applicable to Advanced Format disks which report themselves as having a 4 KB physical sector size, and which emulate a logical addressing interface of 512 bytes.
Note Advanced Format disks introduce a larger physical sector (4 KB). However, to make initial versions more compatible with current computer systems, they maintain a 512 byte logical addressing interface. Therefore, they are known as “512-byte emulation disks,” or “512e” for short. For more information about Advanced Format disks, please visit the International Disk Drive Equipment and Materials Association (IDEMA) website that is listed at the end of this article.
Hard disk drives have traditionally been based on 512 byte sectors, and all access to the physical media was addressed based on this unit. Recently, hard disks vendors have begun to transition to new disks that have a sector size of 4096 bytes (4 KB). These are generally known as an “Advanced Format Disk.” Because disks are only able to perform physical media updates in the granularity of the physical sector (4 KB in this case), a 512 byte write that is directed to the disk will require some additional work in order to be completed. This work comes at the cost of performance and reliability, with the specific cost varying based on the workload and hardware implementation. To avoid this additional work, applications must be updated to natively support writes that are based on the 4 KB sector granularity.
This KB article introduces new storage infrastructure to support querying for the physical sector size of the storage device. Additionally, this KB article introduces support in certain key system components for these kinds of disks in order to improve performance, reliability, and general interoperability.
A more detailed technical discussion into the special considerations developers have to take with these kinds of disks are out of the scope of this KB article and will be detailed in a companion document on MSDN.
Issues that this hotfix rollup package fixesThis hotfix rollup package resolves the following issues that were not previously documented in a Microsoft Knowledge Base article. Any of these following issues can be encountered when you use an Advanced Format disk.
Issue 1 You receive an error message when you click the Check for Updates button on Windows Update siteClick here to view or hide detailed information
Issue 2 An Issue Occurs when many small writes are performedClick here to view or hide detailed information
Issue 3 Applications cannot query the physical sector size of an external storage deviceClick here to view or hide detailed information
Issue 4 Applications cannot query the physical sector size of a storage deviceClick here to view or hide detailed information
Issue 5 Storage drivers do not support correct sector size reporting for Advanced Format disksClick here to view or hide detailed information
Issue 6 Fsutil.exe tool issueClick here to view or hide detailed information
How to obtain this updateIf you are not sure which Windows version is installed, follow these steps:
Click here to view or hide step-by-step instructions with pictures
The following files are available for download from the Microsoft Download Center:
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
Collapse this tableExpand this table
119591Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
(http://support.microsoft.com/kb/119591/ )How to obtain Microsoft support files from online services
PrerequisitesTo apply this hotfix, you must be running one of the following operating systems:
(http://support.microsoft.com/kb/976932/ )Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2
Restart requirementYou must restart the computer after you apply this hotfix.
Update replacement informationThis update does not replace a previously released update.
File informationClick here to view or hide detailed information
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684Microsoft has added sample code to the WDK which provides details about how developers can extract the reported storage access alignment information from the STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR structure when you make a call to the IOCTL_STORAGE_QUERY_PROPERTY control code: http://msdn.microsoft.com/en-us/library/ff800831(v=VS.85).aspx
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Although Microsoft has taken steps to improve support for Advanced Format disks which run alongside Windows 7 and Windows Server 2008 R2, it is up to software developers to update their applications . It is observed to be the general trend of the Storage Industry to transition to larger sector sizes over the coming years, and applications must make sure that they are ready for this transition. Microsoft is preparing additional MSDN and TechNet documentation which will educate Developers and IT Pros as to the special considerations which have to be taken to support Advanced Format disks. The following table details Microsoft supports for different hard disk formats.
Support for Hard Disk Formats based on OS Version
Note Support for Advanced Format disks relies on the disk reporting itself as having 4KB physical sectors, and relies on the Storage Driver reporting the physical sector size.
Collapse this tableExpand this table
For more information, visit the following websites:
General information about ImageX Command-Line Options
Intel Chipset driver requirements to support 4k Sector DrivesFor more information on Advanced Format Disks, visit the following IDEMA website:
Advanced Format (AF) Technology
Are you ready for Advanced Format?Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
Article ID: 982018 - Last Review: March 12, 2012 - Revision: 16.0
Contact us for more help