CF Type I the original 5mm high card
CF Type II cards and devices that are 9mm high.
Type I devices are all solid state but Type II devices include the new IBM Microdrive, a miniature, rotating hard drive.
CF type I - 36.4 x 42.8 x 3.3mm
CF type II - 36.4 x 42.8 x 5.0mm
As you can see, the only physical difference is in the thickness of the card. All Canon EOS DSLRs can take both type I and type II cards, but some cameras can only accept type I cards.
There are also miniature hard drives (Microdrives) with almost the same form factor as CF cards (CF type II, 5mm thick)) which are available in capacities from 340MB to 4GB.
Unknown if CF type I (thin) or II (fat).
Lexar 4GB 40x (no one really uses cards this big, and this 4GB card is physically too fat [CF type II] to fit in smaller cameras, and oddly this 40x is four times the price of the 80x above) ...
Compact Flash Card. A memory storage card of the Compact Flash standard. CF Type I is a 5mm high solid state card, while CF Type II is a 9mm high solid state or Microdrive card.
Chroma
The value of saturation + hue of a pixel; its colour.
Rewritable removable memory or function card developed by SanDisk in 1994. In contrast with SmartMedia or xD-Picture Card technology, it has a built-in controller. The newer CF type II (CF/2) cards are 5 mm thick, the CF type I are only 3.3 mm thick.
The images below show you that CF cards slide almost completely into the reader, the eject button pushed out by the mechanism as soon as you've fully inserted the card. The entrance slot and internal guides are designed to take either CF Type I (3.
 See also: CF, Type, Image, Flash, Camera
  
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