That's good info! I've been looking around for a PATA to USB adapter with SMART support and haven't had a ton of luck narrowing one down. Thinking offhand I may need to cobble together a PATA-to-SATA adapter connected to a SATA-to-USB adapter to actually get some SMART info moving from a PATA drive via USB. It's not the only way to do this but it would be a lot easier if it can be done via USB :/
Also some fun info since you mentioned PATA adapters - The Maxtor OneTouch II is a terrible ATA enclosure, especially on Linux. For whatever reason the built-in chipset does some sort of disconnect right at the end of long operations like formatting, partitioning, etc. so you're never entirely sure if the command worked correctly. I guess it was designed with Windows in mind, or maybe its Linux compatibility isn't 100% there. And of course no SMART info gets passed through.