IMac says 160GB on System Profiler but only 18GB available

Hi All,
A friend's new 17" iMac Intel 1.83GHz only displays 126MB free of 18GB when pressing Apple i but the system profiler states its usual 160GB hard drive. Where can i find this extrqa storage? Is this something new to the Intel macs as i haven't used one of these before? Any clues will be much appreciated.
Thanks,
Carl.

Manufacturers of hard drives do not accurately advertise the space on their drives. This has been an ISO standard since the beginning. This standard has allowed them to call a 1000 bytes a kilobyte, a megabyte 1 million bytes, and a gigabyte 1 billion bytes. As such the drives are missing space based on the fact bytes form 1024 byte kilobytes, etc... If you read the spec footnotes, you'll learn formatted capacity may different and this user tip explains where other space is lost:
http://discussions.apple.com/thread.jspa?threadID=122973&tstart=20

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jwellie wrote:
So I have a black MacBook and everything works fine except for the built-in iSight. I have tried reseting my computer and even did a factory restore, but to no avail. When I checked the system profiler, it recognizes my iSight. Here is what it says under the USB Device Tree:
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Message was edited by: EZ Jim
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