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A camera can stop recording even when its memory card looks mostly empty because free space is only one part of the problem. The card may be too slow for the selected video mode, damaged or incompatible, or affected by a camera-specific file-management limit. Video can also stop if the camera overheats. Start by noting the exact warning and whether it happens with still photos, bursts, or video; the message and your camera manual point to different fixes.
What does the warning actually say?
Before deleting files, formatting the card, or buying another one, write down the camera’s exact message. Manufacturers use different warnings for different faults: examples include “0” recordable images, “Memory card error,” “Read Error/Write Error,” and “Recording was cancelled due to the limitation of the writing speed of the card.” The warning, together with whether you were taking stills or recording video, is the best first clue.
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- A writing-speed warning during video points to the card’s sustained write performance or a mismatch with the selected recording mode.
- A zero-image count may mean the card is full, but on some models it can also mean the camera’s image database or file-management limit has been reached.
- A read/write or memory-card error can indicate incorrect insertion, a locked SD-card switch, a damaged card, or a camera/card access problem.
Panasonic’s LUMIX troubleshooting guidance lists card insertion, read/write errors, card damage, and the SD write-protect switch among possible issues. Its DC-GH6 manual explains that the required card speed depends on the recording format and quality.
Why can video stop when there is still space?
The card cannot sustain the selected recording mode
Video writes data continuously, so having free capacity does not guarantee the card can keep up. The required speed depends on the camera and the chosen format and quality; a high-demand mode such as 4K may have different requirements from a lower-quality mode. Check the card table in your camera’s manual for the exact slot type and recording mode rather than relying on a general SD or CFexpress recommendation.
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Panasonic’s GH6 troubleshooting page identifies the warning “The card does not meet the writing speed requirements for recording.” Canon describes the visible effect of a slow card: the movie buffer indicator rises as recorded data waits to be written, and recording stops when the indicator fills. See Panasonic’s troubleshooting page and Canon Australia’s EOS 5D Mark IV movie guidance. These explanations describe particular manufacturer guidance, not a universal camera interface.
The card’s write performance has deteriorated
A speed-class marking is not proof that a card is still performing as expected. Panasonic notes that writing speed can drop even when a card meets the stated class, and recommends backing up and formatting the card in that situation. If the card still produces errors or video interruptions after the recommended format, test with another card confirmed compatible with your camera and recording mode.
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The camera is too hot
Some cameras terminate video recording to protect themselves from heat. If a temperature warning appears, stop recording and let the camera cool before testing again. Canon’s EOS 5D Mark IV guidance and Panasonic’s LUMIX troubleshooting material both document overheating-related recording protection; the behavior and warning depend on the model.
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On Sony’s ILCE-7M4, a flashing zero recordable-image count can indicate either that the card is full or that the number of images exceeds what the camera’s database file can manage. Sony says that moving images off the card and using the model’s image-database recovery function may restore recording. This is a model-specific issue, not a universal limit on memory cards or cameras. Follow the ILCE-7M4 Help Guide instructions for database recovery rather than assuming the same menu or fix applies to another camera.
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Sony’s ILCE-7M4 guide also gives model-specific capacity estimates: JPEG Fine is estimated at 4,800 images on a 64 GB SD card and 9,600 on a 128 GB card; JPEG Extra fine is estimated at 2,300 and 4,700, respectively. These are estimates for that camera and its stated configuration, not general card-capacity figures. The guide states a maximum of 40,000 still images per memory card for this model.
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What should you check before changing the card?
- Identify when it fails. Note whether the problem occurs for single stills, a continuous burst, or video, and record the full warning or symbol.
- Check compatibility for the exact mode. In the camera manual, find the supported card type and speed requirement for the format and quality you are using. Do not assume a card suitable for still photos is necessarily suitable for every video mode.
- Check seating and the lock. Turn the camera off, confirm the card is inserted correctly, and make sure an SD card’s write-protect switch is not locked.
- Power off before reseating. If the camera reports an access or read/write error, switch it off before removing and reinserting the card. If the warning continues, try a known-compatible card to help distinguish a card fault from a camera fault.
- Protect files before formatting. Copy wanted photos and video somewhere safe before deleting or formatting. Formatting erases images and data, including protected images, as Canon warns in its EOS R6 Mark III formatting instructions. If your manual recommends it, format the card in the camera, especially if it is new or was initialized on a computer or another camera.
- Use the remedy that matches the symptom. For a speed warning, verify the mode-specific requirement and test a compatible card. For a zero count on the ILCE-7M4, consult Sony’s database-recovery instructions. For a temperature warning, allow the camera to cool.
- Escalate persistent errors. If the same warning occurs with a known-compatible card, or the message does not point to a card issue, consult the camera manual or manufacturer service support instead of repeatedly formatting a card that may contain unverified files.
How can you avoid another interruption?
- Choose a card type, capacity, and speed that your camera supports for the recording mode you actually use; confirm the requirement in the model’s manual.
- Back up important files regularly, and verify the backup before formatting or reusing a card.
- Pay attention to recording-speed and temperature warnings as they appear rather than continuing until recording stops.
- If a card that previously worked begins to slow down or generate errors, treat it as potentially unreliable and test with another compatible card after safeguarding its contents.
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