Why Won't My Camera Record to the Memory Card?

"Cannot record," "card error," and recordings that stop after a few seconds do not all mean the same thing. The safe order matters because formatting can fix a file-system problem while also erasing the only copy of a shoot.

Read the symptom before changing anything

Symptom	Likely cause	Safe next step
Camera says the card is locked	SD write-lock tab is engaged	Eject the card and move the side tab up
Card is visible but record is disabled	Unsupported card type or recording mode	Check the camera's card table
Video stops after a few seconds	Sustained write speed is too low or card is failing	Test a lower-bitrate mode after backup
Camera asks to format	File system is unsupported or damaged	Back up with a computer or reader first
Remaining time is zero	Card is full or file limit was reached	Copy files, verify them, then format in camera
Error follows one card across devices	Card is likely damaged	Retire it rather than trusting it again

The safe troubleshooting order

1. Protect the existing files

If the card contains anything important, do not format it yet. Turn the camera off, remove the card, and use a reader to copy the files. Open several clips or photos from the copy before changing the card.

2. Check the physical lock

Full-size SD cards have a small write-lock tab on the side. If it has moved down, the camera can read files but cannot create new ones. Move it up and reinsert the card with the camera off.

3. Confirm the card type

Camera manuals list supported formats by slot and recording mode. SD, UHS-I, UHS-II, CFexpress Type A, and CFexpress Type B are not interchangeable. Some cameras accept two physical card formats in one slot but reserve their highest recording modes for one type.

4. Match sustained speed to the mode

The large number printed on a card is often peak read speed, not guaranteed write speed. The SD Association defines V30, V60, and V90 as minimum sequential write speeds of 30, 60, and 90 MB/s in its Video Speed Class specification overview.

Check the camera manual for the required class. A 200 Mbps recording mode writes roughly 25 MB/s before overhead, but the manufacturer's supported-card table is the deciding source.

5. Test a lighter recording mode

After backup, choose a lower bitrate, frame rate, or resolution. If 1080p records but high-bitrate 4K stops, card speed or mode compatibility moves to the top of the list. If every mode fails, suspect formatting, contacts, or card failure.

6. Format in the camera

Use the camera's format command, not a computer's quick erase, after the files are safe. Sony's recording-error guidance recommends a full camera format when recording has slowed or card errors continue. Formatting erases the card.

If the camera cannot format it, the SD Association's SD Memory Card Formatter can restore the standard file system for compatible SD media. The camera should still format the card again before use.

When to replace the card

Replace a card when errors return after a full format, when the card disconnects during transfer, when recordings fail in supported modes, or when the plastic shell or contacts are damaged. A card that has failed once on a paid or unrepeatable shoot is not the place to save money.

The SanDisk Extreme Pro SDXC 128 GB card is a UHS-I V30 option for stills and standard video modes that require at most 30 MB/s sustained write speed. SanDisk lists the current family as U3 and V30, with up to 200 MB/s read speed for the 64 GB and 128 GB capacities. It is not automatically the right card for every camera. If the camera manual calls for V60, V90, or CFexpress, skip it. The memory-card guide compares those faster formats.

Common mistakes

Do not repeatedly restart a failed recording when the only copy is still on the card. Do not assume "Class 10" is enough for every 4K mode. Do not buy CFexpress or UHS-II until the camera manual confirms support. Do not keep using a card merely because formatting made one error disappear.

Primary sources

• SD Association: Video Speed Class minimum write speeds
• SanDisk: Extreme PRO UHS-I SD card family specifications
• Sony: Recording slowed, stopped, or produced a memory-card error
• Sony: Unsupported memory card message while recording XAVC S
• SD Association: SD Memory Card Formatter

Why does my camera stop recording video after a few seconds?

The card may not sustain the selected bitrate, the mode may require a different card class, the card may be full, or the card may be failing. Back up the files, check the camera's supported-card table, then test a lower-bitrate mode.

Should I format a new memory card in the camera?

Yes, after confirming there is nothing on it you need. In-camera formatting creates the file system and folder structure the camera expects. Reformat after verified backups, not as a first response to an unreadable card.

Does V90 make every camera record better video?

No. V90 guarantees a higher minimum sequential write speed, but a camera with a UHS-I slot or a lower-bitrate mode may gain nothing from it. Buy to the camera manual and recording mode.