From Microsoft

Dec 15, 2009 12:03 GMT  ·  By

Users that have experience glitches in scenarios involving the burning of DVDs from Windows 7 might find a resolve with Microsoft, provided that the issues were generated by Udfs.sys. Microsoft has made available an update designed to take care of three problems associated with the Universal Disk Format (UDF) file system driver (Udfs.sys). The refresh in question is available for both Windows 7 RTM and Windows Server 2008 R2 RTM.

Microsoft described the first problem that Windows 7 users are likely to come across: “You 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.”

The Udfs.sys update for Windows 7 and Windows Server 2008 R2 is currently up for grabs from Microsoft. However, in this sense the refresh is designed more like a hotfix. Microsoft is not serving the fix through Windows Update and had not posted the bits on the Microsoft Download Center. Instead the hotfix can be downloaded from Microsoft Support.

The second issue signaled by the software giant involves: “[formatting] a DVD+/-RW in the Like a USB flash drive format, and then ]writing] some files to the DVD+/-RW. After you eject and then re-insert this DVD+/-RW into the DVD+/-RW drive, you cannot write a file to this 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.” [And ] “Error 0x8007045D: The request could not be performed because of an I/O device error”.”

The update is additionally designed to resolve a problem related to DVD+/-R formatted to be used as 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 100MB file to a DVD+/-R. However, in Windows 7, it takes several hours to write the same file to a DVD+/-R,” Microsoft informed.