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That's really helpful David, as it never switches in use (ie some on card 1 and some on card 2), I think this is the answer:@gramps
From a Google AI dive
It is a known quirk, sometimes reported as a defect, that Fujifilm X-Pro3 cameras can unexpectedly switch SD card slot priorities (e.g., swapping from Slot 1 to Slot 2) when using sequential recording. This often happens if one card is removed to transfer data and the camera is powered on while only one card is present.
Here are the common reasons for this behavior and potential solutions:
Common Causes & Solutions
- Sequential Saving Behavior:In "Sequential" mode, if the card in the primary slot (usually Slot 1) is removed, the camera may default to recording on the remaining card (Slot 2). If you reinsert the first card, the camera might not automatically switch back to it.
- Solution: Check the SAVE DATA SET-UP > CARD SLOT SETTING (STILL IMAGE) in the menu and explicitly set which card to prioritize.
- Dirty or Faulty SD Cards:A card with slightly dirty contacts, or one that is marginally compatible, can cause the X-Pro3 to trigger "Card Error" messages or default to the other slot.
- Solution: Clean the contacts of your SD cards with a soft cloth or isopropyl alcohol.
- Formatting in Camera:Not formatting cards in the camera after removing them to transfer images can lead to slot recognition problems.
- Solution: Always format your cards in the X-Pro3 before starting a new session.
- Internal Firmware Quirk:Sometimes the firmware requires a refresh to properly manage the dual slots.
- Solution: Reinstall the latest firmware for the X-Pro3.
- Camera Switch-On Procedure: If you turn the camera on before the card is fully recognized, it may default to the wrong slot.
Troubleshooting StepsIf the problem persists after trying these steps, it may be a faulty card slot reader, which is a known issue for some X-Pro3 units.
- Check SELECT SLOT(x SEQUENTIAL): Ensure that in the SAVE DATA SET-UP menu, you have chosen the preferred starting card.
- Format Both Cards: In-camera format both cards to ensure they are properly initialized for that specific camera.
- Try New Cards: Some users report that specific brands/types of cards work better. Try a different brand (e.g., Lexar or SanDisk Extreme Pro) to rule out card failure.
- Turn Off Camera While Switching: Never change SD cards while the camera is on, as this can confuse the slot allocation.
End of Google AI Dive
You cannot set up a change slot using a function button, so it is unlikely that any control presses are causing this.
I think it must be that I have switched the camera on while the card from Slot 1 is in the iMac reader and that has caused the switch.Sequential Saving Behavior:In "Sequential" mode, if the card in the primary slot (usually Slot 1) is removed, the camera may default to recording on the remaining card (Slot 2).
I'll keep a watch out not to do that in the future.












