Wikipedia says:
Quote:
Type I and Type II[edit]
The only physical difference between the two types is that Type I devices are 3.3 mm thick while Type II devices are 5 mm thick.[50] Electrically, the two interfaces are the same except that Type I devices are permitted to draw up to 70 mA supply current from the interface, while type II devices may draw up to 500 mA.
Most Type II devices are Microdrive devices (see below), other miniature hard drives, and adapters, such as a popular adapter that takes Secure Digital cards.[51][52] A few flash-based Type II devices were manufactured, but Type I cards are now available in capacities that exceed CF HDDs. Manufacturers of CompactFlash cards such as Sandisk, Toshiba, Alcotek and Hynix offer devices with Type I slots only. Some of the latest DSLR cameras, like the Nikon D800, have also dropped Type II support.[53]
Yeah, both will do, so you can use MicroDrives / SD-to-CF-adapters as well.