How to install UNIX 5.0.7 on an ML 330 G3 server with IDE array instead of scsi bus

My boss get a Proliant ML 330 G3 server with IDE ARRAY Bus, I try to isntall UNIX 5.0.7 on it but i't didn't detect as a hdd, I try to configure it as single logical drive and many combinations but UNIX always says taht there is no hdd, does anyone knows how to?? the boss of course won't say it makes a wrong choice, help me please