A 64 GB SD card can hold anywhere from about 10 minutes to several hours of video: the camera’s recording mode and bitrate determine the time, not the capacity label alone. For example, Sony lists 10 minutes at 600 Mbps and 3 hours at 25 Mbps for selected FX30 modes on a 64 GB card. Check your camera’s estimate for the exact mode you plan to use.
How long will a 64GB SD card record?
There is no single runtime for 64 GB. Bitrate is the most useful starting point: higher bitrates write more data every second and fill the card sooner. Codec, compression, frame rate, scene complexity under variable-bitrate recording, and space already used on the card also affect the result.
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Manufacturer estimates show how widely times can differ. Sony’s FX30 table lists 10 minutes at 600 Mbps and 3 hours at 25 Mbps for selected recording modes. Sony’s ZV-E10 estimates 1 hour 15 minutes at 100 Mbps for 4K, 2 hours at 60 Mbps for 4K, 2 hours 20 minutes at 50 Mbps for HD, and 4 hours 20 minutes at 25 Mbps for HD. These are model- and mode-specific figures, not guarantees for every camera: Sony FX30 recording-time table and Sony ZV-E10 recording-time table.
Resolution by itself is not enough to predict runtime. Two cameras recording 4K—or even the same camera at different 4K settings—can use different bitrates and produce different recording times.
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What recording times do manufacturers estimate?
The figures below are examples for a 64 GB card. They refer to the specific manufacturers’ listed modes or bitrate estimates; they are not interchangeable promises of usable runtime.
| Source and context | Listed mode or bitrate | Estimated time on 64 GB |
|---|---|---|
| Sony FX30, selected modes | 600 Mbps | 10 minutes |
| Sony FX30, selected modes | 25 Mbps | 3 hours |
| Sony ZV-E10, 4K | 100 Mbps | 1 hour 15 minutes |
| Sony ZV-E10, 4K | 60 Mbps | 2 hours |
| Sony ZV-E10, HD | 50 Mbps | 2 hours 20 minutes |
| Sony ZV-E10, HD | 25 Mbps | 4 hours 20 minutes |
| Fujifilm GFX100 II, two listed movie modes at default bitrate | 2160 and 1080 modes | 79 minutes for each listed mode |
| Canon EOS C70, listed XF-AVC modes | 600 Mbps to 17 Mbps | 13 to 472 minutes |
| Canon EOS C70, listed H.265 MP4 modes | 225 Mbps to 9 Mbps | 35 to 891 minutes |
See the Fujifilm GFX100 II memory-card capacity table and Canon EOS C70 specifications and recording-time tables for the mode-specific details. The contrast between Canon’s two formats is another reason to identify the codec and bitrate rather than asking only how long “4K” fits.
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How to estimate runtime from bitrate
If your camera or recording settings show bitrate, a rough calculation is:
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Recording time in seconds ≈ usable card capacity in megabits ÷ bitrate in megabits per second
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A nominal 64 GB is about 512 gigabits before formatting and other unavailable space. The actual usable capacity is lower, and a calculation from nominal capacity should be treated as a rough ceiling rather than a promised runtime. For a ready-made reference, SanDisk’s approximate 64 GB estimates are 320 minutes at 24 Mbps, 480 at 17 Mbps, 640 at 13 Mbps, 880 at 9 Mbps, 960 at 8 Mbps, and 1,280 at 6 Mbps. SanDisk says usable time can vary with file size, resolution, compression, bitrate, content, device, and other factors; the table was published in 2022 and updated June 3, 2026: SanDisk video storage-time estimates.
- Find the bitrate for the exact recording mode. Use the camera’s menu or manual; do not infer it from “4K” or “1080p” alone.
- Estimate from the card’s available capacity. Divide available megabits by megabits per second, then convert seconds to minutes or hours.
- Use the camera’s remaining-time display as the practical check. Variable-bitrate recording can consume space at different rates; Sony notes that complex or fast-moving scenes may shorten recording time in the FX30 and ZV-E10 guides linked above.
Will any 64GB SD card work?
Not necessarily. A 64 GB card belongs to the SDXC family, defined by the SD Association as capacities over 32 GB through 2 TB; SDXC uses exFAT. The camera must support SDXC and the card’s format: SD Association capacity definitions.
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Capacity and speed class are separate considerations. The SD Association describes speed classes as minimum sequential performance under defined conditions and advises choosing a class at least as high as the host device requires. Its guidance maps V30 and U3 to a minimum sequential write performance of 30 MB/s. That is not a universal rule that every 4K mode needs the same card; follow the camera’s requirement for the selected mode: SD Association speed-class guidance.
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- Check the manual’s required card speed class for your chosen resolution, frame rate, and codec.
- If the manufacturer publishes an approved-card list, verify the specific card against it.
- Format the card in the camera when its manual recommends that procedure, and check the displayed remaining time before an important recording.
For example, Canon’s EOS C70 specifications list SDXC support and approved cards, including a 64 GB Panasonic RP-SDZA64GAK rated C10/U3/V90. That example applies to the C70 and should not be treated as a universal recommendation for other cameras: Canon EOS C70 specifications.
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What can stop recording or split a clip?
Available storage is only one limit. A camera can stop a session because of its own recording limit, heat, power conditions, or card compatibility. Sony documents an approximately 13-hour single-movie-session product limit for both the FX30 and ZV-E10; those are model-specific limits, not a general SD-card maximum. The same guides warn that recording conditions, temperature, power state, and settings affect operation, and that the camera may stop if it becomes too hot.
A clip may also be split into multiple files without the camera stopping. Canon specifies 4 GB file division for FAT32 on the EOS C70 and no such division unit for exFAT. Fujifilm says long clips on the GFX100 II may be recorded across multiple files without interruption. Check the behavior for your model and file system rather than assuming a new file means the recording ended.
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