No need to add another drive. Also, I’m not particular about the brand, just want something that will be compatible. The last one I tried was a Rocketfish 2.5" USB SATA External Hard Drive Enclosure. That was the one the kid at Best Buy insisted would fit. You’re right on with the problem being the connectors not matching up. I’ll check for an IDE at the site you recommend.
Any additional thoughts are appreciated.