Sign in with Microsoft
Sign in or create an account.
Hello,
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.

Introduction

This article describes a Windows 7 update that fixes a data corruption issue that occurs in Secure Digital (SD) cards.

More Information

Issues that this update fixes

You have an NTFS-formatted SD card. You use Advanced Direct Memory Access (ADMA) to transfer data between the SD card and a computer that is running Windows 7. However, during this operation, the data on the SD card may be corrupted. Additionally, unexpected problems may occur when you try to use the affected data.

During an ADMA transfer process, the Secure Digital Bus Driver (Sdbus.sys) converts the DMA data structure of the operating system to the ADMA data structure of the SD card. The DMA and the ADMA data structures are also known as descriptor tables. A descriptor table contains a data length value and a buffer address. The data-length field is 16-bit, and it has a maximum size of 64 kilobytes (KB). However, during the data conversion process, the Sdbus.sys driver does not check the buffer size in the descriptor table of the system. Therefore, the Sdbus.sys driver may set an incorrect data length in the SD descriptor table. For example, the Sdbus.sys driver may set the data length to something longer than 0xFFFF. Also, I/O corruption occurs, in this scenario. This, in turn, causes data corruption.

Update information


You can download this update from the Microsoft Update Web site or from the Windows Download Center.

Windows Update Web site

http://update.microsoft.com

Windows Download Center

The following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 7

Download Download the update package now.

All supported x64-based versions of Windows 7

Download Download the update package now.


For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services
Microsoft 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.

Prerequisites

There are no prerequisites to apply this update.

Registry information

To use the update in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

File information

The English (United States) version of this update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

Windows 7 file information notes


  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.16xxx

    Windows 7

    RTM

    GDR

    6.1.760
    0.20xxx

    Windows 7

    RTM

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Sdbus.sys

6.1.7600.16436

84,992

08-Oct-2009

02:31

Sdbus.sys

6.1.7600.20544

84,992

08-Oct-2009

02:35

For all supported x64-based versions of Windows 7

File name

File version

File size

Date

Time

Sdbus.sys

6.1.7600.16436

109,056

08-Oct-2009

02:45

Sdbus.sys

6.1.7600.20544

109,056

08-Oct-2009

02:49

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!

×