How many clips can you keep before offloading? At 100 Mb/s, this 256 GB card holds about five hours of footage with 10% of the capacity left free. The 200 MB/s figure printed on the pack matters most when copying those clips to a computer.
Our assessment. We would consider this card for a camera that accepts 256 GB UHS-I microSDXC media and calls for V30. Choose a different card if your recording mode requires V60 or V90. This review covers part SDSQXCD-256G-GN6MA, Amazon France ASIN B09X7DMBVF. Figures are manufacturer specifications or estimates. We have yet to measure a sample.
200 MB/s and V30 answer different questions
SanDisk rates this capacity at up to 200 MB/s read and 140 MB/s write. To approach the peak read figure, SanDisk specifies a compatible QuickFlow reader. The supplied SD adapter changes the physical fit. Your computer’s reader still determines the interface speed.
On the camera, look for V30. This rating specifies 30 MB/s sustained sequential writing under the standard’s test conditions. A 100 Mb/s video stream represents 12.5 MB/s. Check the camera manual for the precise recording setting, particularly if you change codec, frame rate or enable proxy recording.
How much footage fits on 256 GB?
Two cameras shooting in 4K can produce very different file sizes. These estimates use decimal gigabytes, a constant total bitrate and 25.6 GB left free.
| File bitrate | Space per hour | Time with 10% free |
|---|---|---|
| 60 Mb/s | 27 GB | 8 h 32 min |
| 100 Mb/s | 45 GB | 5 h 07 min |
| 120 Mb/s | 54 GB | 4 h 16 min |
Six 20-minute track sessions at 120 Mb/s need around 108 GB. A 128 GB card can cover that schedule with 10% to spare. Pick 256 GB if you also want practice runs, paddock footage or a second day away from a computer. To estimate your own needs, shoot ten minutes in your usual mode and multiply the file size by six for an hourly figure.
Action camera, stills camera or dashcam?
Action camera. Start with microSD, UHS-I and V30 when checking the Insta360 GO Ultra requirements. For the DJI Osmo Action 5 Pro, also check DJI’s list of capacities. Approval of a 32 GB SanDisk does not automatically extend to the 256 GB version.
Full-size SD slot. Use the adapter if the manual allows it. For XAVC S-I 4K at 600 Mb/s on a Sony α7 IV, choose a full-size SDXC V90 for that mode. The Extreme PRO name spans several card families.
Dashcam. For continuous overwriting, look for documented endurance at the exact capacity. Peak write speed cannot tell you how many hours of loop recording a card will tolerate. Compare the MAX ENDURANCE range for this application.
Will a faster reader save you time?
A 100 GB folder takes about 18 min 31 s at an actual 90 MB/s, versus 9 min 16 s at 180 MB/s. These are calculations. If you offload every evening, the reader and destination drive also deserve attention.
What a hands-on test still needs to establish
We plan to record the card reference, reader, USB port, camera, firmware and recording mode, time the same folder transfer and check playback after a long take. Copy speed and recording stability will be reported separately.
What seven buyers of the 256 GB version reported
We reviewed a sample of 40 Amazon France comments marked as verified purchases. The selection was sorted by top reviews across all capacities. Seven comments concerned the 256 GB card reviewed here. The other 33 covered the 64, 128 or 512 GB versions.
While filming. One videographer described several indoor and outdoor 4K sessions without dropped frames or corrupted files. Another buyer was pleased with the card in an Insta360 X5 but gave no recording settings. The reports describe those owners’ setups. Neither gives enough detail to establish performance across all modes or recording lengths.
When offloading. One buyer timed a 20.8 GB folder of mixed files between an SSD and the card. Writing to the microSD took around 5 min 30 s, with displayed speeds from 45 to 78 MB/s. Reading the folder back took about 4 min, with a reported average of 85 MB/s. That gives a useful reference for offloading footage. The reader was not identified, so these results describe the buyer’s setup and are separate from SD Finder’s own testing.
Value for money. Two buyers commented favourably on value. A drone owner liked the card but found it expensive. When choosing between 128 and 256 GB, compare today’s price with the amount of footage you want to keep between offloads.
Read owner reviews on Amazon France.
Who should buy the 256 GB version?
For a V30-compatible camera, 256 GB is useful if shoots regularly exceed two hours at 120 Mb/s or if you need several sessions between offloads. If you rarely fill 128 GB and mainly want quicker transfers, check the reader first.
★ Editors’ pick · Video on V30 microSD
SanDisk Extreme PRO microSD
This version advertises reads up to 200 MB/s. That matters most when offloading several cards with a compatible reader after a shoot. Inside a camera that calls for V30, the relevant figure is the class minimum of 30 MB/s sustained writing.