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About reading a UDF formatted disk in Windows 7

    Question

  • Dear Mr/Mrs

    We have a question about the difference between reading a UDF formatted disk in Windows XP and Windows 7.

    Description:

    Currently, we have problems in reading a UDF formatted disk in Windows 7

    In Windows XP, the disk is read normally, but in Windows 7, the content displays nothing.

    After investigating, we’ve found the difference between a general UDF formatted disk and ours as following:

    - Typically, Main Volume Descriptor Sequence of a general UDF formatted disk is formatted as below.

    LSN

    Description

    32

    Primary Volume   Descriptor

    33

    Implementation Use   Volume Descriptor

    34

    Partition   Descriptor

    35

    Logical Volume   Descriptor

    36

    Unallocated Space   Descriptor

    However, ours is formatted as following:

    LSN

    Description

    32

    Primary Volume   Descriptor

    33

    Logical Volume   Descriptor

    34

    Partition   Descriptor

    35

    Unallocated Space   Descriptor

    - Length of Extended Value Attributes(L_EA) of File Entry in the Root Directory is as below:

    In our disks, the Length of Extended Attributes(L_EA) value is 0. Therefore, byte 176 is the location of Allocation Descriptors, instead of Extended Attributes.

    We have tried using the following hotfixes which are related to udfs.sys of Windows 7 and Windows 7 Service Pack 1, but we still can't read our UDF formatted disks.

    No

    Link

    OS

    Content

    1

    http://support.microsoft.com/kb/975617

    Windows   7

    An   update is available for the UDF file system driver (Udfs.sys) for Windows 7   and Windows Server 2008 R2

    2

    http://support.microsoft.com/kb/977015

    Windows   7

    You   are repeatedly prompted to insert a new disk when you use the Backup and   Restore tool in Windows 7 or the Windows Server Backup tool in Windows Server   2008 R2 to back up your files or to create a system image on a recordable   Blu-ray disc (BD-R)

    3

    http://support.microsoft.com/kb/2583905

    Windows   7

    Slow   performance when you copy more than 10 gigabytes of data to a Blu-ray disk in   Windows 7 or in Windows Server 2008 R2

    4

    http://support.microsoft.com/kb/2411000

    Windows   7

    You   cannot read or copy a file that contains an asterisk character in the stream   name in Windows Vista, in Windows Server 2008, in Windows 7 or in Windows   Server 2008 R2

    5

    http://support.microsoft.com/kb/2566584

    Windows   7

    The   content of some DVDs cannot be read by Windows 7 or by Windows Server 2008 R2

    6

    http://support.microsoft.com/kb/978526

    Windows   7

    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

    7

    http://support.microsoft.com/kb/2614451

    Windows   7

    "Snbsp; 0x0000007E" error occurs when you write some data onto a CD or DVD in   Windows Server 2008 R2 or in Windows 7

    Questions:

    1. Besides the above hotfixes, do you have any other hotfixes which involve reading a disk with UDF format?

    Would you please send them to me?

    2. Would you please instruct me the difference between reading a UDF formatted disk in Windows XP and Windows 7?

    I'm looking forward to hearing from you.

    Monday, June 04, 2012 7:49 AM

Answers

All replies

  • Hi ,

    Was the UDF formatted disk written on a XP system?

    If so, disk is not finalized since they have to add files on different systems.

    The compatibility problem is caused by changes which have been applied to the UDF kernel file system driver of Windows 7.

    Due to these changes, the driver does not recognize CD, DVD or BD discs consisting of one or more complete sessions and of one incomplete session.

    The incomplete session consists of one reserved and one invisible track.

    The last recorded blocks of each of the complete sessions and of the invisible track store UDF VAT ICBs.

    Drivers of Windows Vista and earlier versions of the Windows OS ignored the incomplete session and, thus, supported accessing the information in the complete sessions.

    The driver of Windows 7 fails to access the information. 


    Tracy Cai

    TechNet Community Support


    Tuesday, June 05, 2012 8:48 AM
  • Hi Tracy Cai

    Thanks for your anwser.

    The UDF formatted disk was written on a Linux system.

    But I think it has same problem.

    To solve this problem, do you have any idea?

    Thursday, June 07, 2012 4:08 AM
  • Hi ,

    There is a similar thread which you may refer to. It mentioned a KB article, you could check if it helps.

    reading UDF 2.0 File Format from CD XP Pro SP3


    Tracy Cai

    TechNet Community Support


    Friday, June 08, 2012 6:04 AM
  • Hi All,

    The article link that you posted is meant reading UDF 2.0 File Format from CD XP Pro SP3 for Windows XP. I tried with this http://support.microsoft.com/kb/975617 and it still not solving the issue. 

    I'm having similar issue to read UDF file format on windows 7 machine

    looking forward to hear from you

    Friday, December 28, 2012 8:29 AM
  • Add me to the list of people unable to read UDF discs from Win7.

    I created the discs myself about a year ago using ImgBurn under Win7. Since then, I had to reinstall Windows following a hardware upgrade. Now I can't read many of my old discs.

    I discovered that I could suddenly read my discs again as soon as I reinstalled "ImgBurn", but as soon as I rebooted, the ability to read UDF discs was gone again. Unimaginably frustrating.

    I CAN read the disk from XP & Linux, just not Win7.

    I tried the hotfixes. No go. No idea where to go from here.



    Tuesday, November 26, 2013 7:53 PM
  • This is not a host drive, it's a DVD Rom.
    Tuesday, November 26, 2013 10:07 PM