The safest way to format an SD card is in the device that will use it, usually through the camera's Format card menu. On a computer, choose exFAT for cards of 64GB and above, or FAT32 for cards of 32GB and below. Formatting erases everything on the card, so copy your files off first.
One quick check before you start. Full size SD cards have a small lock switch on the side. Slide it up, away from the contacts, or nothing will let you format.
Which File System Should You Use?
Card size decides it. The SD standard sets a file system for each class of card, and cameras expect that format.
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Card class
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Capacity
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Standard file system
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Works with
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SDSC
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Up to 2GB
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FAT12 or FAT16
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Older cameras and devices
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SDHC
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Over 2GB to 32GB
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FAT32
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Almost everything; single files capped at 4GB
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SDXC
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Over 32GB to 2TB
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exFAT
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Modern cameras, phones, Windows, Mac
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SDUC
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Over 2TB to 128TB
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exFAT
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Newer devices that support SDUC
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That 4GB cap on FAT32 matters for video. A long 4K clip on a FAT32 card gets split into several files, or stops. Class definitions come from the SD Association's card standards page.
Skip NTFS for memory cards. Most cameras can't read it, and a Mac can't write to it.
How to Format an SD Card in a Camera
Menus differ by brand, but the path is close on most bodies.
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Insert the card and switch the camera on.
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Press Menu and open the setup tab, often shown as a wrench icon.
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Choose Format card (Sony calls it Format, Nikon Format memory card).
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Confirm. It takes a few seconds.
Why the camera first? It writes the folder structure it expects, so you avoid "card cannot be accessed" errors mid shoot. Some Canon bodies also offer a low level format, a slower and more thorough wipe. Use it when a card has thrown errors.
How to Format an SD Card on Windows 11
No built in slot? A USB card reader works the same way.
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Insert the card and open File Explorer.
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Click This PC and find the card under Devices and drives. Check the size so you don't pick the wrong drive.
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Right click the card and choose Format.
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Under File system, choose exFAT for 64GB and up, or FAT32 for 32GB and under. Leave Allocation unit size on Default.
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Type a short name under Volume label if you like.
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Tick Quick Format, then click Start and confirm.
FAT32 missing from the list? Windows only offers it on drives up to 32GB. A 64GB card needs exFAT anyway.
Card not in This PC? Right click Start, open Disk Management and look for the card there. If it shows as unallocated space, right click it and choose New Simple Volume.
How to Format an SD Card on a Mac
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Insert the card, or connect a card reader.
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Open Disk Utility from Applications > Utilities, or search for it in Spotlight.
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Click View > Show All Devices. Select the card itself in the sidebar, not the volume indented under it.
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Click Erase and give the card a short name, like CANON or GOPRO.
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Under Format, choose ExFAT for 64GB and up, or MS-DOS (FAT) for 32GB and under.
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Under Scheme, choose Master Boot Record. Cameras expect it.
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Click Erase and wait for the Done message.
Picking the card itself, rather than the volume, is what makes the Scheme menu appear. Skip that and the card can end up in a layout some cameras won't read.
How to Format a microSD Card on Android
Menu names vary by brand and Android version.
Samsung Galaxy:
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Open the My Files app.
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Tap the SD card under Storage.
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Tap the three dot menu in the upper right corner.
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Choose Format, then tap Format again to confirm.
Most other Android phones: open Settings > Storage, switch to the SD card, tap the three dot menu and choose Format.
Also, some phones provide Format as their form of storage. This combines the storage with the phone’s built-in memory and encodes it so that it will only function on that particular phone. Choose portable storage if you will be moving your storage to a camera or computer.
Quick Format vs Full Format
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Quick format
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Full format
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What it does
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Clears the file table so the card reads as empty
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Clears the table, overwrites the data and checks for bad sectors
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Time
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Seconds
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Minutes to over an hour on large cards
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Use it when
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Routine reuse of a card that works fine
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The card shows errors, you bought it used, or you're selling or giving it away
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Quick format is fine almost every time. A full format earns its wait when a card has acted up, because it finds weak areas the quick version skips. It also makes old photos much harder to recover, which is what you want before a card leaves your hands. On Windows, untick Quick Format to run one. In a camera, use the low level option if there is one.
Use the SD Card Formatter for Fewer Mistakes
The SD Association, the group that writes the SD standard, publishes a free app called SD Memory Card Formatter for Windows and Mac. It only lists SD cards, so there's little risk of wiping the wrong drive. It reads the card's size and applies the matching file system on its own. The SD Association recommends it over the tools built into operating systems, which can leave a card formatted in a way that runs slower.
When Formatting Does Not Fix It
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Format is greyed out, or Windows says the card is write protected. Check the lock switch. With a microSD card, check the switch on the adapter too.
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Card doesn't appear at all: try another port, another reader, or another computer before blaming the card.
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Errors come back after a full format. The card is wearing out. Copy anything left on it and stop using it.
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A card that formats but shows far less space than its label may be fake capacity.
Replacing a card? The Digiera LSU200 UHS-II SD card is a V90 rated card for cameras that shoot high bitrate video. For phones, action cameras and drones that take microSD, there's the Digiera LT100 microSD card.
Back Up First, Then Format
Formatting is instant. Getting the files back is not. Copy everything to two places, a computer and a drive or cloud folder, and check they open before you format. Then format in the camera before each shoot, and the card starts clean every time. If you need a fresh card then explore digiera's SD and microSD cards range.
FAQs
Should I format an SD card in the camera or on a computer?
In the camera when you can. It sets up the folders and file system it expects. Use a computer for cards going into phones, drones or other devices, or when the camera can't read the card at all.
Should I use exFAT or FAT32 for an SD card?
Use exFAT for 64GB cards and above, while 32GB and below need FAT32. This complies with the SD card standard, ensuring that my camera or device will easily read the card.
Why can't I format my SD card to FAT32 in Windows?
Windows will not give you an option to create a FAT32 file system on your SD cards that are above 32GB. This is because above 32GB, the standard is exFAT.
Does formatting an SD card erase everything?
Yes, from the card's point of view. A quick format leaves the old data recoverable with the right software until it's overwritten. A full format overwrites it.
How do I format a microSD card on Android?
On Samsung, open My Files, tap the SD card, then the three dot menu and Format. On most other phones, go to Settings > Storage, select the SD card and choose Format.
How often should I format my SD card?
Before each shoot, once your files are backed up, is a common habit. Formatting is better for the card than deleting files one by one in the camera.
Can I recover photos after formatting an SD card?
Often, after a quick format, if you stop using the card right away. Recovery software can scan for files that haven't been overwritten yet. After a full format, recovery is unlikely.
