The maximum file size for a single file on a FAT32 file system is not exactly 4 GB, but rather slightly less than that. FAT32 uses a 32-bit file allocation table, which means it can theoretically support file sizes up to 4,294,967,295 bytes (which is 4 GB minus 1 byte).

However, in practical terms, the maximum file size is usually constrained by the operating system or the software used to create or manipulate the file. Some operating systems or software may impose additional limitations, such as a maximum file size of 2 GB or 4 GB.

Furthermore, while FAT32 technically supports file sizes up to 4 GB minus 1 byte, it may not be the most efficient or reliable choice for handling very large files due to its limitations. For handling larger files, other file systems like NTFS (New Technology File System) or exFAT (Extended File Allocation Table) are typically more suitable.

Microsoft did not explicitly stop supporting FAT32 for formatting 64GB drives, but rather the limitations of the FAT32 file system itself led to practical considerations. FAT32 has inherent limitations in terms of maximum volume size and file size.

FAT32 has a maximum volume size limit of 32 GB when formatting drives in Windows. While there are ways to format larger drives with FAT32 (e.g., using third-party utilities or command-line tools), it’s not officially supported by Windows due to compatibility and stability concerns.

Given the limitations, Microsoft and other operating system developers have shifted towards file systems like NTFS (New Technology File System) and exFAT (Extended File Allocation Table) for handling larger drives and files. NTFS, in particular, provides better performance, security features, and support for larger volumes and files compared to FAT32.

Therefore, while FAT32 remains useful for smaller drives and compatibility with older systems and devices, its limitations make it less suitable for modern storage solutions, especially when dealing with larger capacities like 64GB or more.

Related: Why did Microsoft drop the feature to format 64GB flash drives as FAT32?

Microsoft has not made an official announcement on why the option to format FAT32 is no longer available for devices 64GB in capacity and above.

In both Windows 10 and Windows 11 the format option given by Windows is either NTFS (New Technology File System) or exFAT (Extended File System). The option to format FAT32 is no long available in Windows.

Without an official announcement from Microsoft we can only speculate the reason is do to single file sizes averaging a larger size as of 2023.

The largest single file size supported by the FAT32 file system is 4GB. This is due to the limitations of the file system’s design. FAT32 uses a 32-bit file allocation table, which means it can address up to 4,294,967,295 clusters. Since each cluster in FAT32 is typically 4KB in size, the maximum file size is limited to 4GB (4,294,967,295 clusters multiplied by 4KB per cluster).

If you need to store files larger than 4GB, you will need to use a different file system that supports larger file sizes, such as NTFS (New Technology File System), exFAT (Extended File Allocation Table), or others. NTFS, in particular, is commonly used in modern Windows operating systems and supports much larger file sizes, making it suitable for storing large files and operating system installations.

We speculate, to reduce customer inquiries or complaints to Microsoft they have eliminated the option of FAT32 to any device of 64GBs or larger in capacity. The reason is that a user will receive an error message from the device when an attempt to copy a single file of 4GBs or larger to a FAT32 device. To reduce the frequency of error messages, by formatting the device as exFAT will eliminate this error.

The ExFAT (Extended File Allocation Table) file system supports significantly larger file sizes compared to FAT32. The maximum file size supported by ExFAT is a staggering 16 exabytes (EB), which is equivalent to 16 million terabytes (TB) or 16 billion gigabytes (GB). This vast file size limit allows for storing extremely large files, such as high-resolution videos, large databases, or disk images.

ExFAT was specifically designed to overcome the limitations of FAT32, including the maximum file size restriction. It is commonly used in various devices and operating systems, including Windows, macOS, and some embedded systems, for handling large files and providing interoperability between different platforms.

It’s important to note that while ExFAT supports large file sizes, the actual maximum file size might be limited by the specific implementation or the capabilities of the storage medium itself.

If the above information was helpful, please consider looking at some advanced flash drives offered by Nexcopy. Advanced functions include USB copy protection, USB write protection, USB CD-ROM, and HIPAA compliant flash drives. These functions are done at the hardware level and are universal solutions.