INTRODUCTION
An update is available the Universal Disk Format (UDF) file system driver (Udfs.sys) for Windows 7 and for Windows Server 2008 R2. This update fixes the following issues in Udfs.sys:
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Issue 1You try to back up some large files to a DVD-RW by using Windows Backup in Windows 7 or in Windows Server 2008 R2. However, the backup operation fails, and you receive an error message that resembles the following:
Logical Block Address Out of Range (SCSI_ADSENSE_ILLEGAL_BLOCK).
Additionally, the Eject function does not work. Therefore, you cannot eject the DVD-RW by following these steps:
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Click Start, and then click Computer.
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Right-click the DVD-RW drive, and then click Eject.
Note For detailed steps on how to back up files to a DVD in Windows 7 or in Windows Server 2008 R2, see the "How to back up files to a DVD in Windows 7 and in Windows Server 2008 R2" section.
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Issue 2You format a DVD+/-RW in the "Like a USB flash drive" format, and then you write some files to the DVD+/-RW. After you eject and then reinsert this DVD+/-RW into the DVD+/-RW drive, you cannot write a file to the DVD+/-RW. Additionally, you receive the following error messages:
An unexpected error is keeping you from copying the file. If you continue to receive this error, you can use the error code to search for help with this problem.
Error 0x8007045D: The request could not be performed because of an I/O device error.
Note The "Like a USB flash drive" format is a kind of UDF format.
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Issue 3You format a DVD+/-R in the "Like a USB flash drive" format. When you try to write files to the DVD+/-R, the writing speed is very slow. For example, on a computer that is running Windows Vista, it takes about 20 seconds to write a 100 megabyte (MB) file to a DVD+/-R. However, in Windows 7, it takes several hours to write the same file to a DVD+/-R.
More Information
Known issues with this update
After you install this update, you may experience an issue in which Windows Explorer stops responding when you insert a recordable Blu-ray disc (BD-R) into the Blu-ray drive on the computer. To resolve this issue, click the following article number to view the article in the Microsoft Knowledge Base:
978526 FIX: Windows Explorer may stop responding when you insert a recordable BD-R into the Blu-Ray drive on a computer that is running Windows 7 or Windows Server 2008 R2
Update information
How to obtain this update
A supported update is available from Microsoft.If the update is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the update.Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific update. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the update is available. If you do not see your language, it is because an update is not available for that language.
Prerequisites
To apply this update, you must be running Windows 7 or Windows Server 2008 R2.
Restart requirement
You must restart the computer after you 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 the times for these files are listed in Coordinated Universal Time (UTC). The dates and the 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 the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 and Windows Server 2008 R2 updates are included in the same packages.
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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 and Windows Server 2008 R2
RTM
GDR
6.1.760 0.20xxx
Windows 7 and Windows Server 2008 R2
RTM
LDR
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GDR service branches contain only those fixes that are widely released to address widespread, extremely important 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 |
|---|---|---|---|---|
|
Udfs.sys |
6.1.7600.16435 |
246,784 |
07-Oct-2009 |
02:30 |
|
Udfs.sys |
6.1.7600.20543 |
246,784 |
07-Oct-2009 |
02:28 |
For all supported x64-based versions of Windows Server 2008 R2 and of Windows 7
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
Udfs.sys |
6.1.7600.16435 |
327,680 |
07-Oct-2009 |
02:34 |
|
Udfs.sys |
6.1.7600.20543 |
327,680 |
07-Oct-2009 |
02:39 |
For all supported IA-64-based versions of Windows Server 2008 R2
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
Udfs.sys |
6.1.7600.16435 |
820,736 |
07-Oct-2009 |
01:52 |
|
Udfs.sys |
6.1.7600.20543 |
820,736 |
07-Oct-2009 |
02:03 |
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
How to back up files to a DVD in Windows 7 and in Windows Server 2008 R2
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Click Start
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In the Search box, type Backup and Restore, and then press ENTER.
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In the left panel, click Create a system image.
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Click One or more DVDs, and then click Next.
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Click Start Backup to start the backup process.
