For a 64GB SDXC card, the best file system is exFAT. This is the official SD Association standard for SDXC cards (32GB–2TB). exFAT supports large files over 4GB, works on Windows, macOS, and modern Linux distributions, and is optimized for flash storage. Most cameras, gaming consoles (Nintendo Switch, Steam Deck), and Android devices recognize exFAT natively.

The key differences are:

• Max file size: FAT32 has a 4GB single-file limit; exFAT supports files up to 16 exabytes (virtually unlimited).
• Max partition size: FAT32 technically supports up to 2TB, but Windows limits formatting to 32GB; exFAT supports up to 128PB.
• Compatibility: FAT32 works on virtually every device; exFAT is supported on modern systems but may not work on very old devices (pre-2009).
• Overhead: exFAT has less overhead than FAT32 for large storage, making it faster for big cards.

Microsoft artificially limits FAT32 formatting to 32GB in Windows' built-in format tool. The FAT32 specification actually supports partitions up to 2TB. To format a 64GB+ card as FAT32, you can use third-party tools such as SD Memory Card Formatter, Rufus, GUIFormat, or command-line tools like mkfs.vfat on Linux. However, for most modern use cases, exFAT is recommended for cards over 32GB.

Most dash cams and security cameras recommend FAT32 for maximum compatibility and reliable loop recording. Even for cards larger than 32GB, many dash cam manufacturers suggest formatting to FAT32 using a third-party tool. FAT32's simple structure ensures stable continuous writing and reduces the risk of file corruption during sudden power loss. Always check your dash cam's manual for the manufacturer's specific recommendation.

Technically yes, but it's not recommended for most cases. NTFS is a journaled file system designed for hard drives, and the constant journaling writes can increase wear on flash memory. Most cameras, gaming consoles, and mobile devices cannot read NTFS. Only use NTFS on an SD card if you exclusively use it with Windows PCs and need features like file compression, encryption, or permissions.

The Nintendo Switch supports FAT32 and exFAT. For cards 32GB and under, FAT32 is used. For cards 64GB and above, the Switch will prompt you to format to exFAT (or you can pre-format it). However, some users report occasional corruption issues with exFAT on the Switch, so some prefer to format larger cards as FAT32 using third-party tools for added stability—though exFAT is officially supported.

It's simple:

• Windows: Right-click the SD card in File Explorer → Properties. Look at the "File system" field.
• macOS: Right-click the SD card on the desktop → Get Info, or check in Disk Utility.
• Linux: Run lsblk -f or sudo blkid in terminal to see the file system type.

Yes. Formatting erases all data on the SD card. A Quick Format only removes the file table (data can potentially be recovered with software). An Overwrite/Full Format writes to every sector, making recovery nearly impossible but taking much longer. Always back up your data before formatting. If you accidentally formatted a card, stop using it immediately and use data recovery software to attempt file restoration.

For most users, the default allocation unit size is recommended. Here's a quick guide if you want to optimize:

• General use: Default (usually 128KB for exFAT, 32KB for FAT32 on large cards).
• Lots of small files: Smaller cluster size (e.g., 4KB–16KB) to reduce wasted space.
• Large media files (video/photo): Larger cluster size (e.g., 64KB–256KB) for slightly better performance.
• SD cards for cameras: Use the camera's built-in format function—it will choose optimal settings.

The SD Memory Card Formatter (from the SD Association) is specifically designed for SD cards and ensures compliance with SD standards. It automatically selects the correct file system for your card type (FAT32 for SDHC, exFAT for SDXC/SDUC), uses optimal formatting parameters, and can help resolve compatibility issues. For general use, your OS format tool works fine, but if you encounter problems or want guaranteed SD-standard compliance, the official tool is the best choice. It's free and available for Windows and macOS.