I have actually tested this card several years ago and had it working just fine with an internal SCSI hard drive. This particular card supports both internal and external SCSI hard drives for use with the MacWorks Plus version of the Mac OS.I had marked spots on the PCB to drill holes for mounting an internal HD onto the card, but I never got around to it. I do not have the software disks handy but they are easy enough to find online. I do however have found the original Owner's Manual. Both items are in excellent condition. An excellent upgrade for your Lisa 2 or Macintosh XL computer! Please view my other items for sale! The item "APPLE LISA SCSI HARD DRIVE Expansion CARD w. MANUAL SUN REMARKETING" is in sale since Monday, August 27, 2018. This item is in the category "Computers/Tablets & Networking\Vintage Computing\Vintage Parts & Accessories". The seller is "wozniac" and is located in New Westminster, British Columbia. This item can be shipped worldwide.