Time Machine HD does not appear in Disk Utility

Hello,
I used Time Machine towards the end of 2007 on an external SATA HD through USB 2.0. I would frequently turn it on and let it do its thing and shut it off. One day I attempted to use Time Machine and it did not mount on my desktop. I've been searching around trying to discover a solution to this problem without any success. The HD does not show up in Disk Utility nor does it show up in XP when it is connected to my mobo with SATA. I did manage to see it under "Disk Management" in XP but was unable to assign it a drive letter. It showed the amount of space used but other than that I haven't been able to get it to work. I have since purchased a larger HD for time machine and all I really want to do is transfer over the contents of the currently non-working HD to the new HD and then format the old one. I'm asking around to see if any of my friends have an external SATA enclosure so I can find out if it is the enclosure or the HD but in the mean time is there anything I can do in Leopard (or Windows XP) to find out if the information is on the HD or if the HD is damaged?

I am sorry - I simply do not understand your instructions!
I have 2 Time Capsules and have been using both.  However a few days ago they quit working.  I have had to turn off Time Machine because I am getting hourly alerts that back-up failed because there is not enough space.  It does not delete old backups to provide additional space.  I am willing to erase both to try to get them working again but I cannot figure out how to erase and setup the drives.  Hence I turned Time Machine off.
There is nothing wrong with the MBP internal hard drive.  "Sparse bundle" is total Greek to me!  My wifi network appears to be working properly.  The internal HD is mounted in Disk Utilities and verified as working properly.  I am a long time user of Apple but I am still a novice (Level 1)!
Perhaps I should start a new thread.

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