Found this on Transcend website. Seems to suggest Transcend CF is UDMA. Posting spec in case you see anything important in there?
•Support Global Wear-Leveling, Static Data Refresh, Early Retirement, and Erase Count Monitor functions to extend product life
•Operation Modes: PC Card Memory, PC Card IO, True IDE
•True IDE Mode supports: UDMA0-5, MDMA0-4, PIO0-6 (UDMA5 as default)
•True IDE Mode: Fixed Disk (Default)
•PC Card Mode: Fixed Disk (Default)
•Advanced Power Shield prevents data loss in the event of a sudden power outage
Roofus