Disk image could not be mounted - error

Ok, I've been using TC (Time Capsule) for a week now, and it was working great. Then in the middle of the week I decided to change the password for TC. Now when I reboot my iMac, TM (Time Machine) will not back up and it gives me a failed - "the backup disk image could not be mounted" error. Then if I go to the AirPort Utility and reboot TC, all of the sudden TM works. Couple of days go by and when I reboot the iMac again, I have to do the whole process again of rebooting TC to get TM to work. Has anyone encountered this issue? I think I explained it well...

This happened to me too.
I called Apple (they'll talk to you for 90 days after you buy your Time Capsule and solve all your problems.)
The solution was to rename the Time Capsule. Here's how:
Open Time Capsule in System Preferences, click on Change Disk, and choose None from the list.
Open Airport Utility (choose Go from the Finder Menu, choose Utilities from the list, then Airport Utility), highlight your Time Capsule when its picture appears in the left side bar. Click Manual Setup in the main window, then the Disk icon on the top. Highlight the lower of the two names Time-Capsule Disk and change it to something short and one word, like Disk. Click Update, then close Airport Utility after your Time Capsule restarts.
Go back to Time Capsule Preferences and click on the Choose Disk button in the center of the main part of the window, then choose your newly-named Time Capsule (If you see more than one Time Capsule name there, restart your computer first).
This solved it for me. The guy on the phone said that in the tech help people's experience the Time Machine program doesn't like long names or ones with "higher" ascii characters in them.
Good luck.
jmb

Similar Messages

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    So I'm trying to back up to time machine, which used to be working fine, but I have this problem happening on two computers now (which probably means the error is in my Time Capsule.)
    The Time Capsule shows up on my "shared" list in my finder windows.
    I can connect to it, and open the folder inside, and SEE my two disk image files in there.
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    I spoke to someone at Apple, who sent me the Time Machine Troubleshooting page:
    http://support.apple.com/kb/HT3275?viewlocale=en_US
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    4. tried to delete the sparsebundle, but it would choke at almost the end, sometimes it would just crash the finder, sometimes say "Sorry, an unexpected error occurred," sometimes "Operation cannot be completed because the item 'bands' is in use." I even tried to Stuff the bundle with 'delete original' checked, but the stuffing, after about 15 hours, jammed near the end (stuffed 20 gigs of 35 gigs).
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  • The Backup Disk Image Could Not Be Mounted

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  • Time machine error: The backup disk image could not be mounted

    Time Machine worked OK for several months. Now I get this error every 10 minutes or so.
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    If your Time Machine backup drive (“Backup of Users Computer”) is mounted on your desktop or in the Sidebar of the Finder window. then Time Machine may think the drive is already in use. Alternatively, if the Time Capsule hard disk has been recently accessed by a Windows machine, it may not have fully relinquished control. Do the following:
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    Make sure your computer has a proper name. Go to System Preferences --> Sharing. Time Machine needs to differentiate your computer from others on your network (i.e. "Bills MacBook" or "Office iMac"). If the "Computer Name" field is blank, create a name. Realize that if this step is necessary, you will likely have to start the Time Machine backup process over again and do another full initial backup.
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    Click “Disconnect All Users…” at bottom of window.
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    First, it is important to distinguish this error message from another, similar Time Machine error that states “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
    Consider each topic below separately. When one option does not resolve your issue, then move on the next one.
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    If, for some reason, you have manually mounted the Time Machine backup disk image (sparsebundle), or Time Machine failed to eject it after the previous backup, subsequent backups may fail. (Console - “Failed to mount disk image”… “Backup failed with error: 21”)
    Eject the backup disk image (white drive icon) by either clicking the little Eject icon to the right of the disk image in the Finders’ Sidebar, or Ctrl-Click the drive icon on the desktop and select “Eject” from the contextual menu. Now try backing up again or launching Time Machine to view previous backups.
    *“Disconnect All Users…”:*
    If your Time Machine backup drive (“Backup of Users Computer”) is mounted on your desktop or in the Sidebar of the Finder window. then Time Machine may think the drive is already in use. Alternatively, if the Time Capsule hard disk has been recently accessed by a Windows machine, it may not have fully relinquished control. Do the following:
    Open Airport Utility and select the Time Capsule on the left.
    Click “Manual Setup”.
    Select “Disks” at top of window.
    Click “Disconnect All Users…” at bottom of window.
    Close the Airport Utility.
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    Make sure your computer has a proper name. Go to System Preferences --> Sharing. Time Machine needs to differentiate your computer from others on your network (i.e. "Bills MacBook" or "Office iMac"). If the "Computer Name" field is blank, create a name. Realize that if this step is necessary, you will likely have to start the Time Machine backup process over again and do another full initial backup.
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    Cheers!

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    towersfamily,
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    First, it is important to distinguish this error message from another, similar Time Machine error that states “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
    Consider each topic below separately. When one option does not resolve your issue, then move on the next one.
    *Unmount the Backup Disk Image* (TC)
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    Eject the backup disk image (white drive icon) by either clicking the little Eject icon to the right of the disk image in the Finders’ Sidebar, or Ctrl-Click the drive icon on the desktop and select “Eject” from the contextual menu. Now try backing up again or launching Time Machine to view previous backups.
    *“Disconnect All Users…”:*
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    Open Airport Utility and select the Time Capsule on the left.
    Click “Manual Setup”.
    Select “Disks” at top of window.
    Click “Disconnect All Users…” at bottom of window.
    Close the Airport Utility.
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    According to this article, [http://support.apple.com/kb/TS1760], Time Machine may experience problems if your computer name includes certain characters. Make sure the computer name only includes ASCII characters from the following set.
    (0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ)
    Once a change in the computer name occurs, you should stop and restart Sharing on the affected computer. Uncheck and then recheck Sharing in the Services list on the left.
    Let us know if any of the suggestions above helped to resolve your issue.
    Cheers!

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  • Fix to the problem-- Back up Disk Image could not be mounted

    In order for TC to backup your entire HD it needs to create a Disk Image on your Mac. For example you would have seen your computer do this operation if you ever installed programs on your Mac computer.
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