Time machine failed... Disk already in use

On one of my two MBP's using time machine, the 2.33GHz Mac constantly displays this message. I found that the problem exists because to time Machine disk will not unmount after each backup. If I physically unmount the disk, it will function normally.
What do I have to do to have TM unmount the disk after each incremental backup?

Pull the power cord from the back of the Time Capsule
Count to ten
Plug the power cord back into the back of the Time Capsule
Wait a few minutes, then try a backup

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    If you are using OS 10.7.5 as your profile shows, you should have Airport Utility 5.6. If you select the drive and open manual setup you can disconnect all users.
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    John Seal wrote:
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    I have already used time machine backup and I last used on june 2012 . Today when I tried to backup the time machine is still stuck on preparing my backup?What shallI do?

    See Section C here  >  http://pondini.org/TM/Troubleshooting.html
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  • Time Machine fails repeatedly with no problem detected on the external disk

    Since a couple of days, Time Machine fails repeatedly, several times a day. I repair the disk with the Disk utility, that finds no error, then I reset Time Machine as indicated, and after one or two successful backups, it fails again, with the following report given by the Time Machine Buddy widget:
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    Stopping backupd because the backup volume was ejected!
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  • Time machine fails on new iMac

    I upgraded to a new 21.5" iMac from a g5 iMac.  I transferred my files and have two external hard drives one with photos and one for time
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    Do not backup your startup volume to another partition on the same drive. If the drive fails you have nothing. Always backup to another drive or volume on another drive.
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    Clone the internal drive to the external drive
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  • Time Machine "Backup Disk Not Available" over WAN

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    4/12/15 12:06:17.938 PM com.apple.backupd[10741]: Backup failed with error 11: 11
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    Any idea how to get around this problem?  The GOPRO0169.MP4 file seems to be fine, and readable.

    Start with A4 in the 1st linked article.
    Time Machine Troubleshooting
    Time Machine Troubleshooting Problems

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