How do I remove a disk from Time Machine

Just replaced a dead disk on my sister's iMac.
Didn't have an extra external disk at the time, so started Time Machine using a second partition on the new disk.
Now have a spare external disk plugged in.
I have Time Machine backing up to the external disk.
But how do I remove the internal disk partition from Time Machine???
Do I just delete the backup file???
This ought to be simple but I can't figure it out.

Use Disk Utility to erase the partition.
Select the volume containing the backup (one of the entries indented to the right below the physical drive).
Click the erase tab and click erase. Ensure the default file system is set (Mac OS extended (journalled)).
How you proceed from there depends which partition has the OS.
Select the physical drive in DU (the top entry with the maker's name and drive size)
Select the partition tab.
You have a graphic of the partitions. the one you just erased will be all white, the OS partition will be partly blue.
If the the OS partition is the top one, drag the bottom corner to the full depth of the window. That will eliminate the erased partition.
If the OS partition is the bottom one, and you need the space, you'll need to erase the entire HDD and repartition.
typos edited by: noondaywitch

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    Restoring Your Emails from a Time Machine Backup
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    That’s it!UPDATE (20-January-2009): After step 4., also restore ~/Library/Preferences/com.apple.mail.plistThanks Jon C.
    If you have multiple mail accounts, you should also restore the ~/Library/Preferences/com.apple.mail.plist file as well. This will ensure all of your account settings are imported. – Jon C.
    Follow me on Twitter here.
    40 Comments
    Chucho
    May 13th, 2008 at 11:11 amThanks it’s a great hint, you should post it in macosxhints.com
    Westin
    May 19th, 2008 at 3:28 amAwesome content and great instructions even for stupid people like me. Thank you so much for posting this. It worked like a charm and really is appreciated at 2:30 a.m. after hours of reinstalling junk.
    Slippery Snake
    June 23rd, 2008 at 9:15 amThis worked. However, I had three email accounts, and it only imported one. My Smart Mailboxes were not imported either.
    Jon C
    July 30th, 2008 at 2:50 pmIf you have multiple mail accounts, you should also restore the ~/Library/Preferences/com.apple.mail.plist file as well. This will ensure all of your account settings are imported.
    Joseph Hurtado
    August 26th, 2008 at 11:23 amRaffy,This tip is worth it’s weight in gold! Thanks so much for posting such a well though out recipe for a Mail Rescue operation.Just put Jon’s advice on the article, that is also very valuable!Take care,Joseph Hurtado
    from Toronto
    Cory
    December 3rd, 2008 at 9:25 amYou saved my life! Thanks!
    Drew
    January 19th, 2009 at 12:08 amCheers Great tip! Thank you very much for your time!
    Lizart
    May 23rd, 2012 at 2:00 pmStill working in May of 2012! Thanks so much!
    source
    May 29th, 2012 at 11:11 amIm getting a teeny problem. I cant get my reader to pick up your feed, Im using bing reader by the way.
    Bruno Zysman
    May 31st, 2012 at 4:56 pmThanks so much for this tips
    I could get back my 170 000 mails in 5 hours thanks to this post, after having tried for few hours without success…Bruno

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