False Hard Drive Available Space Reading

Yesterday, I was adding a partition to my hard drive. i was going to create "Macintosh HD_2". i had 90GB left on my 160GB hard drive and the partition i was creating was about 70GB. Halfway through the partitioning process, a message prompted that my mac needed to be restarted. After restarting... i opened a finder window and there was only one disk image "Mactinosh HD". there was no HD_2. here comes the frustrating part... my macintosh HD has only 20 GB of free space left, almost as if there was a partition taking up the other 70GB... but, like i said, the other disk image is nowhere to be seen. this isn't the first time this has happened, when i had OS 10.5.1, i tried to do the same thing, with the exact same results. when apple released OS 10.5.2, it fixed the problem. I dont really want to wait for 10.5.3 for this to be fixed... Any ideas?

Does Disk Utility still show your total hard drive capacity as 160 GB, or does it show it as being 70 GB or so smaller? If it still shows as 160 GB, then it looks like the partition you attempted to create may have created some sort of file that is taking up space. If your total hard drive capacity has changed to 90 GB (160 GB - 70 GB), then it would seem that you have created a partition that you cannot see.
Assuming that your drive still shows as 160 GB, you can try to see what is taking up the space by using WhatSize or Disk Inventory X:
http://www.id-design.com/software/whatsize/
http://www.derlien.com
Disk Inventory X if free. WhatSize used to be, but there is a small charge now.
One of these should be able to tell you what is occupying 70 GB.
Also, it's good practice to keep 15%-20% of your hard drive free for best operation of the OS. 20% of 160 GB would be 32 GB. Your partition would have left just 20 GB. Don't know, but this might be part of the problem.
Good luck!

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