I have these 2 CFs which I have used on my 2 weeks trip to Thailand last week.
Came back with just half of all my images intact, lost about 900 over images!!! Further investigation revealed that all images lost are all those captured with the Ridata CF.
Each Ridata CF transfers to the X-drive2 are perfect, complete with the comfirmatory 2 'beeps' after the successful transfer. But horror of horrors, when I got home only the Hagiwara CF images are there.
Other than the Ridata's apparent incompatibility with X-drive2, it still works fine capturing images on my A40 camera. Reason enough to claim warranty on the Ridata CF???