install ydl 4.01 on external firewire drive

[Robert Nuzum]

I've asked for help here before but decided to renew request. I have a 
120  gig external firewire drive which has been partitioned by Apple's 
disk utility. I would like to install YDL on the partition, free space, 
for it. The text installer does not recognize the drive, only 
recognizes the internal drive of my eMac. Is there a way to install 
directly on the external drive or must I install only on the internal 
drive which is not preferred.
Thanks for the help, Bob