Windows 8 and 8.1 Forums


Error: Cannot mount ISO image from network folder?

  1. #1


    Posts : 102
    Windows 8.1 Pro x64

    Error: Cannot mount ISO image from network folder?


    Hello,
    under Win 8 Pro 64-bit, I discovered the following oddity: When I try to mount an ISO image using the Windows' built-in mounting function, it works when the the ISO is located on a local drive, but NOT if it is on a network drive (linked to my NAS). The latter case yields an error saying that mounting failed without further explanation. (YES, the Iso file type is associated to Windows Explorer and YES, there is a spare drive letter after the local drive letters; actually my local drives are from B: (DVD) to D:, and the network drives are between F: and Z:, so that a mounted ISO receives a virtual drive at E: .)

    Can anybody confirm this behaviour and possibly shed light on it, or - even better - provide a better solution than installing third-party mounting software like DaemonTools? Is it a bug that Microsoft will hopefully address soon?

    Best,
    Steve

      My System SpecsSystem Spec

  2. #2


    Posts : 480
    Windows 8 Pro x64


    Quote Originally Posted by Steve06 View Post
    The latter case yields an error saying that mounting failed without further explanation.
    Does the ISO actually get mounted despite the error? I've seen this. Check in Computer.

    If not CTRL+C the exact error text and paste here.
      My System SpecsSystem Spec

  3. #3


    Posts : 102
    Windows 8.1 Pro x64


    When I click on Computer in Windows Explorer, I can confirm that network folder ISOs are not mounted. Tried with several ISOs of different size and it always fails. With local ISOs it always works.

    EDIT: Added a screenshot of the error in German. Do not know to what exact error this translates in the English version.
    Attached Thumbnails Attached Thumbnails Unbenannt.PNG  
      My System SpecsSystem Spec

  4. #4


    Posts : 480
    Windows 8 Pro x64


    You can CTRL+C the text, and then it's easier to find out what it means in English.

    Sorry, there was a problem mounting the file
    See if you can dig up something helpful, and then list here what you've tried.
      My System SpecsSystem Spec

  5. #5


    Posts : 102
    Windows 8.1 Pro x64


    The people in the forum at MS Technet Mounting ISO : "sorry, there was a problem mounting the file" are not any further we that problem than we are. At least I could find confirmation that this is a pervasive issue and I am not alone with it.

    It has been suggested in that and other threads that the "sparse" property of an ISO could be the culprit. I checked this with the

    Code:
    fsutil sparse queryflag <PathToYourISO>

    command in one case of an ISO on a network drive and can confirm that the file was not marked as sparse.

    I have also checked if it works when I access the NAS folder not by its network drive letter (N: ), but via its network address \\NAS\\..., but it makes no change.

    At this point, it seems there is no solution unless you use third-party software, as we used to do before Windows 8. The bottom line is that the mounting feature is not a real improvement of the OS as it is buggy or not well designed. This is even more astonishing as nowadays many users have NAS drives in their home.

      My System SpecsSystem Spec

  6. #6


    Posts : 480
    Windows 8 Pro x64


    Well, there's nothing wrong with using third party tools that have worked for years

    Meanwhile, let's check if the problem persist in safe mode with networking.
    And here's the link you should be able to understand better than me Anything there?
      My System SpecsSystem Spec

  7. #7


    Posts : 102
    Windows 8.1 Pro x64


    I can confirm the problem presists in safe mode with networking.

    I already knew this link you indicated. It's about another common problem with the mounting function, namely that you need to have spare drive letter after your local drives. This is not the issue for me as I made space by moving the DVD drive to letter B and it actually works to mount from a local drive.

    Let's wait to see who else stumbles upon this issue or maybe even has a solution?
      My System SpecsSystem Spec

  8. #8


    Posts : 480
    Windows 8 Pro x64


    It's kind of hard to troubleshoot this issue remotely... Another angle to pursue is NTFS permissions. When you copy a problematic ISO to the local NTFS drive, do you have the same problem? You original post doesn't clarify this.

    Also, please download Process Monitor and start monitoring just before you mount. Stop after getting the error. Upload the log to SkyDrive/Google Drive/Dropbox.
      My System SpecsSystem Spec

  9. #9


    Posts : 102
    Windows 8.1 Pro x64


    I ruled out the permission problem by copying an ISO from NAS to local drive and from there it could be mounted.

    Here's a profile monitor log: https://www.dropbox.com/s/tp30vnkxsd3on56/Logfile.CSV
      My System SpecsSystem Spec

  10. #10


    Posts : 480
    Windows 8 Pro x64


    Unfortunately, I can't see the culprit in the log, and neither is my colleague from another forum who's better at analyzing procmon logs than me. It's entirely possible that the real culprit is your NAS, so you'll have to use third-party software for mounting images. However, my colleague suggested trying KB2686098, so I pass his recommendation to you.

    Another long shot is to uninstall third party antivirus and firewall software for troubleshooting purposes. I doubt it'll produce results, given the test in the Safe Mode with Networking, but you never know.
      My System SpecsSystem Spec

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