HT3275 Time Machine doesn't see the back-up disk

Time Machine doesn't see the back-up disk after I've logged off and then back on, even though the disk is available to the iMac 24/7. Turning the disk off and then on in the current session works, but this seems to defeat the purpose of an unattended back-up disk. I can't find a setting that ensures the back-up disk is recognized after log-in or restart. Is there a solution?

Is this Mountain Lion??
It seems to have made some changes that make the disk drop out.. it does this even if you are continually connected to the TC and we don't have a solution yet.
For your login issue, is the TC using a disk password.. or are you setting it to default? Could you try just turning on the guest account in the TC to read and write access and see if this helps. Tell us how it goes.
There is another fix.. but it involves using disconnect all users from v5 airport utility.. Apple removed the function in v6.
If you are on Lion or Mountain Lion even you can install the v5 utility.
How to load 5.6 into ML.
1. Download 5.6 for Lion.
http://support.apple.com/kb/DL1482
Click to open the dmg but do not attempt to install the pkg.. it won't work anyway.
2. Download and install unpkg.
http://www.timdoug.com/unpkg/
Run unpkg on the desktop.. it is very simple.. drag the AirPortUtility56.pkg file over to unpkg.. and it will create a new directory of the same name on the desktop.. drill down.. applications utilities .. there lo and behold is Airport utility 5.6 .. drag it to your main utilities directory or just run it from current location.
You cannot uninstall 6.1 so don't try.. and you cannot or should not run them both at the same time.. so just ignore the toyland version.. the plastic hammer.. and start using 5.6.. a real tool.

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    mwithers wrote:
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    Welcome to the Apple Support Communities
    See > http://pondini.org/TM/C17.html

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  • My time machine will not complete the back up.  It say that my sparsebundle is already in use.  What do I do and how do I fix it?

    My time machine will not complete the back up.  It tells me that my sparsebundle is alreay in use.  I currently have imac ungraded my sofeware to the latest.  What do I do to correct this?

    Try here...
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    From Pondini’s excellent Information Here...
    http://pondini.org/TM/Troubleshooting.htm

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