raid 1 and df command

I got a new server with four 80 GB disks. I create hardware raid 1
(mirroring) on first two disks. Then I created raid 1 (mirroring) on
second two disks. I installed Fedora 5 default install. After
installation from the command prompt, when I typed df -k I see a total
space of about 300 GB. How is that possible?
The OS should see only 160 GB right because the first disk is mirrored
to 2 disk and third disk is mirrored to fourth disk.
While booting up the the message does show two volume groups with 73 GB
each.
Please help.
Thanks,

.

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