Move Time Machine backups from old drive to new, larger drive?

Hi folks,
My external HDD that TM writes to is full. Its oldest backup is only a month ago. I'd like to keep older backups so I'm going to buy a new, larger HDD to use with TM.
I'd like to keep the existing backups that I have, the ones that go back one month.
Is there a way to transfer these from my existing external HDD to my new one, and have TM still recognise them on the new drive?
Many thanks,
Ken.

Hi Pondini,
I've another Time Machine question here: http://discussions.apple.com/thread.jspa?threadID=2732322&tstart=0
Got no replies.
Have searched your excellent Time Machine documentation, but no joy.
Just wondering if you've any ideas on how to use TrueCrypt with Time Machine. Would be most grateful.
Tx and best regards,
Ken.

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    Dark Heart wrote:
    [Quote]Right-click the new volume on your desktop or Finder sidebar and select Get Info. If the Ignore ownership on this volume box is checked, click the padlock at the lower right and enter your Admin password at the prompt. Then remove the check mark from the box and close the window.[/Quote]
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