Urgent help, WD MyBook 500Gb

hey
i just bought an WD Mybook 500Gb, but it wont installed, there are few articals ive checked and it says some system dont support HardDisk;s bigger then 137Gb
how can i know that my system supports or not.
so far i couldnt find the drive on my system, in thoes articals it says i must configure EIDE on bios.

Edit:
nvm, just needed a reboot http://filesharingtalk.com/vb3/images/icons/icon3.gif

Earlier versions of Win XP did not support HDDs larger than 137GB, the only way to install larger HDDs is to upgrade to SP2.