I've connected the adapter to the PATA drive (40 pin). Powered the PATA drive using standard Molex. Slotted the small 4 pin cable (branches off the Molex cable) into the adapter - I believe this powers the PCB / adapter itself (?). Hooked up the adapter to my motherboard's 5th SATA2 port.
The drive itself spins up normally and remains spinning, although it does lag POST by about 20 seconds or so (whilst it's trying to detect drives). I've taken this PATA drive out of my old computer and know that it works. There's no clicking or obvious mechanical malfunction.
I've removed the jumper which, according to the label on the drive, means it will slave (although slave/master state shouldn't matter, right?).
SATA 5: [Not Detected]
I'm slightly clueless...
Maxtor 120GB IDE PATA
PATA -> SATA adapter:
SATA to IDE convertor