Camera memory card types fall into two families: the SD family (SD and microSD), which covers almost every consumer camera, and the professional family (CFexpress, CFast, XQD, CompactFlash), which exists because high-bitrate video and fast RAW bursts exceed what SD can sustain. You cannot buy the wrong family by accident, since the slots are physically keyed, but mixing generations inside a family is easy and expensive — a CFexpress Type A card will not fit a Type B slot, and an XQD card will not work in every CFexpress bay.
The practical takeaway before you shop: the capacity and speed printed on the packaging describe the best case, not the guaranteed case, and the media that protects your footage best in the field is not always the media that is easiest to recover after a failure.
The Eleven Media Types You Will Actually Encounter
Eleven removable or semi-removable media formats are still in circulation. Six are current, five are legacy but common in used bodies.
| Media | Introduced | Typical capacity | Interface | Common hosts | Recovery difficulty |
|---|---|---|---|---|---|
| SD (UHS-I) | 2000 | 32 GB – 512 GB | Single-row contacts | Almost all mirrorless and DSLR bodies | Low |
| SD (UHS-II / UHS-III) | 2011 | 64 GB – 1 TB | Dual-row contacts | Higher-end stills and 4K video bodies | Low |
| microSD | 2005 | 32 GB – 1.5 TB | Single-row, small | Action cameras, drones, phones, adapters | Low, adapter adds a failure point |
| CFexpress Type A | 2020 | 80 GB – 1 TB | PCIe 3.0 x1, NVMe | Sony Alpha cinema-line and hybrid bodies | Moderate to high |
| CFexpress Type B | 2017 | 128 GB – 4 TB | PCIe 3.0 x2, NVMe | Nikon, Canon, Panasonic, Blackmagic | Moderate to high |
| CFexpress Type C | 2023 | 512 GB – 8 TB | PCIe 3.0 x4, NVMe | Cinema bodies and dedicated recorders | High |
| CFast 2.0 | 2012 | 64 GB – 1 TB | SATA | ARRI, older Blackmagic, some Canon | Moderate |
| XQD | 2011 | 32 GB – 240 GB | PCIe 2.0, not NVMe | Nikon D4/D5/D500, early Sony | Moderate |
| CompactFlash (CF) | 1994 | 2 GB – 256 GB | Parallel ATA (PATA) | Legacy DSLRs, industrial cameras | Low in a lab |
| Memory Stick PRO Duo | 2003 | 1 GB – 32 GB | Sony proprietary | Sony compacts and camcorders | Moderate, proprietary format |
| USB-C external SSD | 2018 | 500 GB – 4 TB | USB 3.2 / Thunderbolt | Ninja, Blackmagic Video Assist, direct-to-SSD bodies | Moderate |
Two names on that list are routinely confused. CFast 2.0 and CFexpress Type B have the same outline and were both designed as CompactFlash successors, but they run different protocols: CFast is SATA, CFexpress is NVMe over PCIe. Putting one into the other’s slot can damage the contacts. XQD and CFexpress Type B share a bay in several Nikon bodies, and firmware decides which cards are accepted.
Capacity, Endurance, and Why the Label Numbers Mislead
Flash media is graded on three separate axes, and manufacturers advertise only the flattering one.
Sequential read speed is the number in large type, often 300 MB/s and up. It describes how fast the card hands data to a computer. It has no bearing on whether your camera can record to it.
Sustained write speed decides recording. It is typically one-third to one-sixth of the advertised read figure, and it degrades as the card fills. The labeled guarantees for this number are the class marks, covered in detail in our explanation of card speed classes.
Endurance is expressed in terabytes written (TBW) on professional media and left unstated on consumer cards. A card rated for 300 TBW handles years of heavy video work; an unrated card may begin dropping blocks after two years of daily 4K recording.
One physical detail shapes both cost and recovery: professional cards carry more NAND dies behind a faster controller, which is why the price curve is steeper than the capacity curve. A 1 TB CFexpress Type B card costs far more than four 256 GB SD cards of the same total capacity, because the SSD-class controller inside it is the expensive part. That controller is also the component most likely to fail.
Why CFexpress Is Not Automatically Easier to Recover Than SD
The common assumption is that professional media, being better engineered, must be more recoverable. The opposite is often true, and the reason is architectural.
An SD card presents a simple block device to the host. The card’s internal controller exposes a logical address space that maps fairly directly onto the physical NAND, and the file system on top — almost always exFAT on cards above 32 GB, described in our guide to how file systems on camera cards are structured — keeps a directory you can read. When the directory is damaged by an interrupted write, the image data underneath is frequently still intact and a signature scan can rebuild the file list.
CFexpress Type A, B, and C cards are NVMe SSDs in a camera-shaped shell. They run a full FTL (Flash Translation Layer) with wear leveling, garbage collection, and a logical-to-physical map that lives in controller RAM or in a metadata region on the NAND. The host never sees the physical layout. If the controller dies, the map goes with it, and the NAND cannot be read by software at all. Recovery on a CFexpress card ranges from straightforward (deleted files, when the card is still enumerating) to laboratory work (a card that no longer responds, where the only route is chip-off reading and map reconstruction).
A second asymmetry: CFexpress cards are frequently used in small-capacity shoots with enormous volumes of data. A 4 TB card holding 60 percent capacity is a dense store of irreplaceable footage, so a single failure is more costly even when the odds are identical.
Why Older Media Is Sometimes Easier to Work With
Three legacy formats behave differently from modern cards in ways that favor recovery.
CompactFlash is the most lab-friendly professional media ever made. A CF card is a bare PATA device with a comparatively simple controller and no TRIM. It presents a standard ATA identity, so chip-off work is well documented, pinouts are public, and the number of translation layers between the file system and the NAND is small. A CF card from 2008 with a failed connector is often read successfully in an hour.
XQD sits between the two worlds. It uses PCIe signaling but not the NVMe command set, with a lighter translation layer than CFexpress. That makes controller failure less catastrophic than on NVMe media, though tooling is scarcer because XQD never reached large volumes.
Memory Stick PRO Duo is the opposite case. It is proprietary, uncommon, and its on-card structure is less documented, so recovery options are narrower even though the underlying technology is unremarkable. Legacy is not a synonym for easy.
The unifying point is that recoverability tracks architectural simplicity, not the price of the card.
What Each Media Type Means for Recovery
| Situation | SD / microSD | CFexpress / CFast | XQD | CompactFlash |
|---|---|---|---|---|
| Files deleted in camera | High success, card is not rewritten | High success if the card still enumerates | High success | High success |
| In-camera quick format | High success, no TRIM command | Lower, background garbage collection can reclaim blocks | Moderate | High success |
| Card not detected by any computer | Controller suspected; software cannot help | Controller suspected; laboratory likely needed | Laboratory likely needed | Often recoverable, simpler controller |
| Files overwritten by new shoots | Not recoverable | Not recoverable | Not recoverable | Not recoverable |
| Physical damage (bent, cracked, water) | Laboratory only | Laboratory only | Laboratory only | Laboratory only |
The middle row deserves emphasis. SD and microSD cards have no TRIM command, so a quick format deletes directory entries and leaves the underlying data in place. NVMe-based cards do implement background garbage collection, and an idle card that is still powered can reclaim formatted blocks on its own. That mechanism explains a large part of the gap between media, and it is the same reason deleted photos are recoverable from camera cards at all.
If you are on Windows and the card is still detected by a computer, a purpose-built recovery tool such as XRecovery (xappset.com) can scan SD, microSD, and other memory cards for deleted or formatted photos and videos. As with any recovery tool, stop writing to the card first and always save recovered files to a different drive. When a card is physically damaged or no longer enumerates, the work belongs to a data recovery laboratory, and our guide to recovering from professional cards explains where that line sits for CFexpress and CFast.
Matching the Media to the Camera
The slot determines the family; the recording mode determines the tier.
- Consumer bodies and most hybrids: one or two SD slots. Choose UHS-II if the body supports it, since the cost difference is small relative to the body price.
- Full-frame stills with fast bursts: CFexpress Type B plus an SD backup slot is the standard configuration. Use both slots simultaneously rather than as overflow.
- Cinema and high-end hybrid bodies: CFexpress Type B or Type C, or a direct-to-SSD recording path. SSD recording removes the card from the equation but adds cable and mount failure modes.
- Drones and action cameras: microSD almost exclusively. The small form factor means less thermal mass, and heat is the dominant failure driver in that category, as our overview of drone storage media sets out.
- Cameras with internal memory: some bodies store a buffer of images in eMMC or on a soldered module. That storage behaves like a phone’s, and it is covered in our page on camera internal memory recovery.
Two buying rules cut most of the risk. Buy from authorized sellers, because counterfeit cards report capacities the NAND cannot hold and silently overwrite the oldest files once the real capacity is exceeded — the failure pattern described in our article on fake memory cards. And buy two mid-capacity cards instead of one large one, since capacity itself is a single point of failure.
Frequently Asked Questions
Are CFexpress Type A and Type B interchangeable?
No. The two types share a naming convention but have different physical sizes, contact counts, and lane configurations. Type A is smaller and runs a single PCIe lane; Type B is larger and runs two. Adapters exist for Type A into Type B slots in some bodies, but never the reverse, and not every camera accepts them.
What memory card does my camera take?
Check the slot label or the manual’s specifications page rather than the marketing tier. SD, SDHC, and SDXC all share one slot shape; UHS-II cards fit UHS-I slots but run at the slower bus speed. If the slot is wider than an SD card with two rows of pins, it is likely CFexpress Type B or XQD, and the manual will state which of the two the firmware accepts.
Why is an old CompactFlash card often easier for a lab to recover than a new CFexpress card?
Because it has almost no translation layer. A CF card exposes a simple ATA interface with a direct mapping to the NAND, so extraction and reconstruction are well understood. CFexpress cards keep a logical-to-physical map inside the controller; if that controller fails, the card’s own map is lost and the raw NAND has to be reconstructed from scratch.
Can any software recover a card that a computer cannot detect?
No. Recovery software needs the card’s controller to answer and present addressable blocks. If the card does not enumerate in Windows, macOS, or Linux, the fault is below the file system layer and belongs to a laboratory that can work with the NAND directly.