File.
http://www.sksapps.com/index.php?page=hd.html
Tutorial + Filepack
http://hdadvance.digitalsedative.com/
Also check for your harddrive here.
http://ps2drives.x-pec.com/?p=list

 

It envolves soldering an IDE connector to your PS2. It can be done so just use google to find out.

*edit* I think you have to get a new shell to house the drive but I'm not too sure about that.

 

You might need this.

http://www.coolpc.com.au/catalog/product_i...roducts_id=1248

Apparently the USB drives are slow.