hi,

after starting the install-script you will be asked which hd you would like to use and after that cfdisk will be started. there you can format your hd. i think the 40 gb hd is the second on the first ide controller. so you have to choose hdb.

(remember
master on first ide = hda
slave on first ide = hdb
master on seccond ide = hdc
slave on second ide = hdd)

bye