Nikon Z6 Memory Card Guide: The CFexpress Firmware Upgrade

When choosing a memory card for the original Nikon Z6, there is a specific hardware transition you need to account for. The camera was released back in 2018 with a single card slot designed exclusively for XQD cards.

However, thanks to a major firmware update, this camera can now utilize modern CFexpress Type B cards. If you’re still using older XQD media, upgrading to CFexpress is the single most effective way to speed up your buffer clearing and modernize your workflow. Here is a practical look at exactly how I manage this firmware quirk and find the right cards without overpaying.

Archival Note: Which generation of Z6 are you shooting?

This guide covers the original single-slot Nikon Z6. If you have upgraded to a newer generation with dual slots or high-bitrate video, please see my specific recommendations here:
– Nikon Z6 III Memory Card Recommendations (6K RAW & VPG400 Support)
– Nikon Z6 II Memory Card Recommendations (Dual CFexpress/SD Slots)

Related: current firmware versions and the step-by-step update procedure are in my Nikon Z7 and Z7 II firmware guide.

Nikon Z6 compatibility & requirements

The Nikon Z6 has a single memory card slot. While the physical manual that came in the box labels this as an “XQD” slot, a subsequent firmware release (v.2.20) unlocked compatibility with CFexpress Type B cards.

Because the physical form factor and pin layouts are identical, both card types fit securely into the same slot without any hardware modifications. Nikon officially states that cards with write speeds of 45 MB/s or better are recommended for movie recording, and that slower speeds may interrupt recording¹.

However, because the Z6 only shoots standard 4K/30p video, the camera’s real data bottleneck is high-speed burst photography. A 14-bit uncompressed RAW file sits around 55 MB. When shooting at the camera’s maximum extended burst rate of 12 fps, the camera needs to clear roughly 660 MB/s. Here is how the two compatible media types impact the camera’s performance in the real world:

Media Type	Typical Peak Write Speed	Real-World Z6 Performance Impact
Legacy XQD	~400 MB/s	Buffer clears slowly; camera may lock up during long 12 fps bursts.
CFexpress Type B	1200+ MB/s	Buffer clears almost instantly; highly responsive image playback.

Note on Types: Make sure you purchase Type B. CFexpress Type A (used by Sony) and Type C are entirely different physical sizes and will not fit in the Z6. CFast is also a completely different, incompatible format.

Should you buy a CFexpress 4.0 card for the Z6?

The CFexpress market is currently transitioning from the older 2.0 spec to the newer, twice-as-fast 4.0 spec. Because the cards look identical, navigating this shift is actually a great opportunity to save some cash — if you know what to look for.

The Nikon Z6 is a CFexpress 2.0 camera. It physically lacks the PCIe Gen 4 hardware required to hit the newer 4.0 speeds. This is a hardware limitation that cannot be changed with a firmware update.

Because the CFexpress standard is backward compatible, you can put a bleeding-edge 4.0 card into the Z6, and it will work flawlessly. The camera simply throttles that card down to 2.0 speeds. While you won’t see an in-camera performance bump from a 4.0 card, this backward compatibility opens up some opportunities for smart buying.

In a perfectly logical market, you’d just buy the cheapest 2.0 card you could find. But it’s not that simple. Because manufacturers are aggressively shifting their production lines to the new standard, newer 4.0 cards are sometimes actually cheaper and more readily available than the legacy 2.0 cards they replaced. In a market distortion due to algorithmic pricing based on the limited availability of legacy stock, I’ve even seen older 2.0 cards show up at massively inflated prices that are more expensive than the newer, faster 4.0 replacements.

So, my rule of thumb is to look at the sustained write speeds and go with whatever is cheaper, regardless of whether the label says 2.0 or 4.0. If you spot a 4.0 card for the same price or cheaper than its 2.0 equivalent, grabbing the newer version is a fantastic win. You keep extra money in your pocket today, and as a bonus, you unlock drastically faster desktop offload speeds when you get back to your desk (provided you pair it with a USB 4.0 memory card reader).

Here are excellent, highly-rated options for the Z6. They easily clear the camera’s 660 MB/s burst requirement without making you overpay for top-tier cinema speeds the camera cannot utilize:

The legacy option: XQD

XQD is an older format. While these cards are quick enough for the Z6’s standard 4K video modes, they’re not nearly as fast as CFexpress B cards. Since the price of CFexpress has come down considerably, there’s no practical advantage to buying a new XQD card today. However, if you already own them from a previous camera, they are still perfectly functional to use.

Things worth knowing (firmware & formatting)

The Firmware Catch: If your Z6 isn’t recognizing your new CFexpress B card, the camera’s firmware needs to be updated. You will need an XQD card — at least temporarily — to copy the firmware file into the camera to run the upgrade. The original Z6 cannot update its software automatically over Wi-Fi via the SnapBridge app.

The Formatting Quirk: When you go to format the memory card using the camera’s yellow setup menu, the interface will still refer to the “XQD card” even after the firmware upgrade, regardless of whether you’re using an XQD or CFexpress B card. This is just a menu text oversight by Nikon and does not affect the actual process.

My golden rule is to always initialize cards in the Z6’s menu to ensure the folder structures are built correctly. If you accidentally format the wrong card in the field, stop shooting immediately. Because the camera only performs a high-level format that wipes the directory index, you can usually recover your deleted photos later, as long as you haven’t written new files over the old data.

If your card throws read errors over time, you should connect it to your computer and execute a full format instead of a quick format using a dedicated utility tool to deeply restore the flash memory.

Memory card readers

Don’t forget that you’ll need a compatible card reader. A CFexpress B card will physically fit perfectly in an older XQD card reader, but it will not mount on your computer unless the reader’s hardware was explicitly designed to be cross-compatible.

In my workflow, I use ProGrade Digital readers. They make an excellent XQD/CFexpress B cross-compatible reader with a Thunderbolt 3 connection. If you also shoot with a backup camera that uses SD cards, their dual-slot CFexpress B / UHS-II SDXC reader is incredibly convenient for travel.

Notes & References:

1. Nikon Z6 Reference Manual, p. 492: https://download.nikonimglib.com/archive4/ETCly004tSCE04n36PH98oVIXb69/Z7Z6RM_(En)05.pdf [↩︎]