Failure erasing and restore partition on PB, "cannot unmount disk"

Hi,
I would like to erase a partition that I have on my 30gb internal harddrive.
I get an error message saying something like "cant eject/unmount the disk" same error message when I run the diskrepair.
when I did the restore thing ( disk image of installdisk OSX 10.4) (I skipped the erasing and whent straight for restore) I got another error message. (saying something something and (-10000))
What can I do to erase the partition and restore

Calle:
I would like to erase a partition that I have on my 30gb internal harddrive.
Do you have more than one partition on the HDD? I suspect you have only one since the HDD is only 30 GB.
Your computer is now 8 years old, as is the original HDD. The average life of these drives is 3 to 5 years, so your HDD is well past old age. You may be getting the error messages because your drive is failing.
cornelius

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