Transferring Photos from Iphoto to usb drive

Hi,
I have recently bought a mac and put all my photos onto iphoto, and on a pc in the household the pictures have been deleted. I cannot find any way of transferring these pictures quite simple from iphoto to a hard drive. The only way that seems like it would work is sending the pictures by email but it has a max of 40mb sending.

Does anyone have any suggestions?
Thanks in advance.

iphoto

open iPhoto, click photos in sidebar, select all, file export, when you click export in the dialogue it will open a finder window and select hardrive you wish to export to

Cheers!