A 128GB SD card can record from a few hours to well over 10 hours, depending chiefly on the camera’s selected bitrate and recording mode. For example, manufacturer estimates range from about 2 hours 45 minutes at 100 Mbps to 13 hours at 20 Mbps in specific Panasonic DC-BS1H MP4 modes. Those figures are examples, not guarantees for every camera or card.
Why a 128GB card has no single recording time
Video recording time depends mainly on how much data the camera writes each second. A higher bitrate uses more storage and shortens the time available; a lower bitrate uses less storage and extends it. The label “4K” alone is not enough to predict duration because cameras can offer different bitrates and formats at the same resolution.
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For the most relevant estimate, look up the camera model and the exact recording mode in its manual. Manufacturer tables are approximate: actual duration can vary with shooting conditions and card type, and some modes may reduce available recording time.
Manufacturer estimates for 128GB cards
These examples show how much duration changes with settings and how estimates differ across manufacturers. They apply only to the listed products or guidance, not to every camera.
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| Source and scope | Recording setting | Approximate duration |
|---|---|---|
| Panasonic DC-BS1H, specified MP4 modes at 59.94Hz or 50Hz | 100 Mbps | 2 hours 45 minutes |
| Panasonic DC-BS1H, specified Full HD MP4 mode | 28 Mbps | 9 hours 45 minutes |
| Panasonic DC-BS1H, specified Full HD MP4 mode | 20 Mbps | 13 hours |
| Fujifilm general bitrate and media-capacity guide, updated May 28, 2026 | 100 Mbps | 170 minutes |
| Fujifilm general bitrate and media-capacity guide, updated May 28, 2026 | 50 Mbps | 340 minutes |
| Sony FDR-X3000 XAVC S table, depending on the listed mode | 100 Mbps | 155 minutes |
| Sony FDR-X3000 listed XAVC S mode | 60 Mbps | 255 minutes |
| Sony FDR-X3000 listed XAVC S HD mode | 50 Mbps | 310 minutes |
The figures are not directly interchangeable: the tables cover different cameras, modes, formats and estimation methods. Panasonic’s DC-BS1H manual also cautions that certain loop or segmented recording modes can shorten available time. Panasonic: Video Recording Time with Cards; Fujifilm: What is the recording time for movie? – Continuous time and total time; Sony: Estimated recording time of movies.
Estimate recording time from bitrate
For a rough estimate using a decimal 128GB capacity, divide the card’s capacity in bits by the video bitrate. Since one byte equals eight bits, the calculation in hours is:
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Approximate hours = (128 × 8 × 1,000) ÷ (bitrate in Mbps × 3,600)
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At 100 Mbps, this gives about 2.84 hours before accounting for what the camera and file system consume. The estimate assumes all 128GB is available and excludes audio, metadata, file-system overhead and camera-specific differences. That is why actual manufacturer estimates can be lower: Fujifilm gives about 170 minutes at 100 Mbps, while Panasonic lists about 2 hours 45 minutes for its specified DC-BS1H modes.
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- Up to 128GB to store tons of pictures (1GB=1,000,000,000 bytes. Actual user storage less.)
- Exceptional video recording performance with UHS Speed Class 1 (U1) Class 10 rating for Full HD video (1080p) (UHS Speed Class 1 (U1) designates a performance option designed to support real time video recording with UHS enabled host devices. See consumers speed page on SanDisk site. Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors. Visit the SanDisk Video Knowledge Base for more information.)
- Compatible with SanDisk SD UHS-I card reader (sold separately)
Use the calculation for planning, then check the camera’s remaining-time display or consult its manual for the selected mode. Fujifilm’s recording-time guide explains its bitrate and capacity estimates.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check card compatibility and speed before recording
Recording duration is only part of choosing a card. The camera must support the card’s format and capacity, and the card must meet the sustained write-speed requirement for the recording mode. There is no universal speed-class recommendation that fits every camera and mode, so check the camera’s manual rather than choosing by capacity alone.
Quick Recap
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- From 32GB to 256GB(1) to store tons of pictures and even more Full HD video(2). (1)1GB=1,000,000,000 bytes Actual user storage less
- Exceptional video recording performance with UHS Speed Class 1 (U1)(5) and Class 10 rating for Full HD video (1080p)(2). (5)UHS Speed Class 1 (U1) designates a performance option to support real time video recording with UHS enabled host devices
- Quick transfer speeds up to 100MB/s. Up to 100MB/s[64GB-256GB; 90MB/s for 32GB] read speed; write speed lower Based on internal testing; performance may be lower depending on host device, usage conditions, and other factors 1MB=1,000,000 bytes
- Confirm that the camera supports the card format and capacity. For example, consult the Canon EOS R10 specifications.
- Check the manual for the sustained write-speed requirement of the mode you intend to use.
- Use the camera’s remaining-time display to confirm the estimate with your chosen settings and card.
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