Get HDD Details

Hi. I'm running an older version of the ReadyNAS Duo (Firmware is RAIDiator 5.3.5, it's an old NAS) and one of the hard drives has failed. I'm trying to use the Web login to get the specific details of the hard drive so i can get a replacement. I've checked through everything and i cannot find anywhere that will give me specific make and model details of the hard drive. I rather not pull it out to check as the only person who can get physical access to it might not pull the right one out. Is there anywhere that i can get this information or do i have no choice but to put out the disk (hopefully the right one) and check it that way? Thanks