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A mostly empty card can still stop recording: the card may be too slow for the selected video mode, its write performance may have degraded, or the camera may be reporting a card, database, temperature, or compatibility problem. Start by noting the exact warning and whether it happens with photos, burst shooting, or video; those details point to different fixes.
Start with the exact warning
Do not assume that free space is the issue just because the card looks mostly empty. Record the full message shown by the camera, including whether it says there are “0” recordable images, reports a memory-card or read/write error, or says recording stopped because of writing speed. Also note what you were doing when it happened: taking a single still, shooting a burst, or recording video.
The wording matters. A writing-speed warning points toward the card’s sustained write performance or the recording mode’s requirements. A zero-image count may mean the card is full, but on some cameras it can also mean an image database or file-management limit has been reached. A temperature warning, by contrast, points to the camera rather than card capacity.
Why a camera can stop with space still available
The card cannot keep up with the recording mode
Video recording requires data to be written continuously. The required speed depends on the camera, recording format, and quality setting, so a card that works for photos or lower-quality video may not satisfy a higher-quality mode. Panasonic’s GH6 troubleshooting page describes the warning “The card does not meet the writing speed requirements for recording.” Check the card requirements for the exact mode in your camera’s manual, not just the general card recommendations.
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Canon explains the consequence of a slow card in its EOS 5D Mark IV movie guidance: data waiting to be written causes the movie buffer indicator to rise, and recording stops when that indicator fills. Free capacity does not prevent this; the issue is how quickly the card can accept data.
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 specified class. If the card used to record successfully in the same mode but now produces a speed warning, back up its contents and test another known-compatible card. If the replacement works, the original card may have deteriorated or become damaged.
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The camera cannot access the card properly
Incorrect insertion, a damaged card, read/write failure, or—in the case of an SD card—a locked write-protect switch can prevent recording. Panasonic lists these among relevant card-error causes. Power the camera off before removing and reinserting the card, and check that an SD card’s lock switch is not set to lock.
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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 its image-database recovery function may restore recording after images have been moved off the card. This is specific to that model; it is not a universal limit or diagnosis for every camera. If the warning matches, follow the ILCE-7M4 help guide’s instructions rather than deleting files at random.
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- Save time with card offload speeds of up to 200MB/s powered by SanDisk QuickFlow Technology (Up to 200MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec. SanDisk QuickFlow Technology is only available for 64GB, 128GB, 256GB, 512GB and 1TB capacities. 1GB=1,000,000,000 bytes. 1TB=1,000,000,000,000 bytes. Actual user storage less.)
- Pair with the SanDisk Professional PRO-READER SD and microSD to achieve maximum speeds (sold separately)
- Shot speeds up to 140MB/s (Write speed up to 140MB/s. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec.)
- Perfect for shooting 4K UHD video and sequential burst mode photography (Full HD (1920x1080) and 4K UHD (3840 x 2160) video support may vary based upon host device, file attributes and other factors. See HD page on SanDisk site.)
- UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) (UHS Speed Class 3 designates a performance option designed to support 4K UHD video recording with enabled UHS host devices. UHS Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS enabled host devices. See the SD Association’s official website.)
The camera has overheated
Some cameras stop movie recording to protect themselves when internal temperature rises. Canon’s EOS 5D Mark IV guidance identifies temperature as a cause of movie recording termination, and Panasonic also documents overheating protection. If a temperature warning appears, let the camera cool before trying again; changing cards will not solve an overheating warning.
Troubleshoot in this order
- Identify the mode and message. Note the exact warning and whether it occurs during stills, continuous bursts, or video. A writing-speed warning and a zero-image count suggest different paths.
- Check the camera’s card requirements. In the manual, find the supported card type and the required speed for the precise recording format and quality you selected. Requirements can vary by mode, including for 4K video.
- Check the physical card. Confirm it is inserted correctly. If it is an SD card, check that the write-protect switch is unlocked.
- Power off before reseating. If the camera reports a card-access or read/write error, switch it off before removing and reinserting the card. If the error remains, try a different card known to be compatible with your camera and recording mode.
- Protect files before changing the card. Copy any wanted images and videos somewhere safe before deleting or formatting. Do not format a card if you have not verified that important files are backed up.
- Format only when appropriate. When the camera manual recommends formatting—such as for a new card or one initialized in a computer or another camera—format it in the camera. Canon warns that formatting erases all images and data, including protected images.
- Test the likely cause. If video stopped with a speed warning, try a known-compatible card that meets the mode’s requirement. If the camera showed a temperature warning, let it cool. If a Sony ILCE-7M4 showed a database-related zero count, use that model’s image-database recovery guidance.
- Escalate if the problem persists. If the same warning appears with a known-compatible card, consult the camera manual or manufacturer support. Repeatedly formatting a card with files you have not verified is not a safe diagnostic step.
Choose a replacement card by camera and mode
There is no single card type, capacity, or speed rating that is right for every camera. Confirm the card format supported by your camera and the speed requirement for the recording mode you need. A card suitable for still photos may not meet the sustained-write requirement of a demanding video mode. Match the camera manual’s specific card table rather than choosing by capacity or speed label alone.
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- Save time with card offload speeds of up to 200MB/s powered by SanDisk QuickFlow Technology (Up to 200MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec. SanDisk QuickFlow Technology is only available for 64GB, 128GB, 256GB, 512GB and 1TB capacities. 1GB=1,000,000,000 bytes. 1TB=1,000,000,000,000 bytes. Actual user storage less.)
- Pair with the SanDisk Professional PRO-READER SD and microSD to achieve maximum speeds (sold separately)
- Shot speeds up to 90MB/s (Write speed up to 90MB/s. Based on internal testing; performance may be lower depending upon host device. 1MB=1,000,000 bytes. X = 150KB/sec.)
- Perfect for shooting 4K UHD video and sequential burst mode photography (Full HD (1920x1080) and 4K UHD (3840 x 2160) video support may vary based upon host device, file attributes and other factors. See HD page on SanDisk site.)
- UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) (UHS Speed Class 3 designates a performance option designed to support 4K UHD video recording with enabled UHS host devices. UHS Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS enabled host devices. See the SD Association’s official website.)
If the camera accepts the card but reports that it is too slow for a particular mode, either use a compatible card that meets that mode’s stated requirement or select a recording mode the current card supports. Do not treat a higher speed rating as a guarantee that a card is healthy or compatible with every camera.
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Model-specific limits are not universal capacity rules
Sony’s ILCE-7M4 Help Guide illustrates why a zero count may not map neatly to a card’s remaining gigabytes. For that camera, Sony estimates 4,800 JPEG Fine images on a 64 GB SD card and 9,600 on a 128 GB card; for JPEG Extra fine, its estimates are 2,300 and 4,700 respectively. These are estimates for the identified camera and settings, not general capacity figures for other cameras or cards. Sony also states that the ILCE-7M4 allows a maximum of 40,000 still images per memory card. Treat that as a model-specific image-management limit, not a general memory-card rule.
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