CFexpress Type A is the smaller card and Type B is the larger one, and they are not interchangeable. Your camera slot decides which you can use, so the choice is made by your camera model rather than by preference. Check your manual or the maker’s page to confirm.
Size and shape
Type B is roughly the same footprint as the older XQD card, which is why some bodies that had XQD slots later gained support for Type B. Type A is noticeably smaller and thinner. A card that does not match the slot simply will not fit, so there is no risk of inserting the wrong one by accident, but it is easy to buy the wrong one online.
Where each type is used
- Type B appears in many professional and enthusiast mirrorless and DSLR bodies from several makers.
- Type A is used by a smaller group of cameras, notably some from Sony’s Alpha line, and many of those slots also accept SD cards.
Camera lineups change, so always confirm on the maker’s page rather than relying on a general list.
Practical differences
| Trait | Type A | Type B |
|---|---|---|
| Physical size | Smaller | Larger |
| Typical home | Compact-bodied cameras with dual-purpose slots | Larger bodies built for heavy shooting |
| Capacity range | Usually smaller options | Usually wider range |
| Card readers | Need a Type A reader | Need a Type B reader |
How to choose
- Find the card type listed in your camera’s specifications.
- Check whether the slot also accepts another format, such as SD.
- Buy a reader that matches the card type, since a reader for one shape does not take the other.
- Compare sustained write speed if you record video or long raw bursts.
Treat any speed figure on a package as the maker’s own claim, and confirm it against the camera’s recommended card list.
It also helps to think about the whole workflow, not just the slot. A card is only useful if you can copy files off it, so check that your computer, hub or dedicated reader handles the same shape. Buying a spare card of the same type means you can swap in a fresh one during a long day without changing anything else about your setup.
FAQ
Can I use an adapter to put Type A in a Type B slot?
Adapters exist for some uses, but whether a camera accepts them reliably varies. Check with the camera maker before depending on one for important work.
Is one type better than the other?
Neither is better in general. Each is designed for a size class of camera, and the best one is the one your camera supports.
The Short Version
Type A is small and Type B is larger, and your camera slot dictates which one you need. Confirm the supported type on the maker’s page, then match your card reader to it. After that, compare speed and capacity for your kind of shooting.
