Trying to Erase Drive

Hi,
I have a Macbook model A1181 running on version 10.5.8 that I would like to sell. I need to erase the hard drive but when I go through the disk utility option, the erase function is disabled. When I restart the computer while pressing the command+R buttons, nothing happens, except the utilities folder is opened upon start up. I've also tried erasing through the terminal but the error message I received was "Could not unmount disk for zeroing. Partitioning encountered error on disk disk0: Could not unmount disk (-10000)." If anyone is familiar with this error message or these issues, PLEASE HELP!

Hello there, favered4.
The following Knowledge Base article provides information on how to perform the erase, although written for Snow Leopard, the steps should be the same:
Mac OS X v10.6 Snow Leopard: How to Erase and Install
http://support.apple.com/kb/HT3910
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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Trying to Erase Drive

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