What's the Largest Possible File Size?

The video investigates the theoretical and practical limits of how large a single file can be. It explains that a file system is the scheme used by storage media to organize and keep track of files, and that file size limits are determined by how many bits are used to represent a file's length. The host contrasts older 32-bit file systems like FAT32, which could only express up to about 4.2 billion bytes and thus cap file sizes at roughly four gigabytes, with newer 64-bit systems such as NTFS that raise the theoretical ceiling dramatically. It is noted that NTFS supports 64-bit file sizes, giving a theoretical limit far beyond consumer drives, but real world constraints come from operating system limits. The discussion then moves to concrete figures, stating that Windows 10 imposes an OS-level cap of about 17.5 terabytes for a single file, which is still larger than most drives available at the time of filming. The video closes by acknowledging that while future file system innovations could push these limits further, current hardware and software environments already stretch far beyond what most users will ever encounter. Throughout the explanation, the presenter ties these limits to practical storage considerations like hard drives, solid state drives, and media formats while keeping a light note about future possibilities such as novel storage technologies. The episode also contextualizes the discussion with examples such as a single 4K movie size and the historical shift from FAT32 to NTFS, emphasizing how architectural choices in file systems directly influence how much data can be stored in one file. It highlights that, although the theoretical limits exist, the usable limit is often dictated by the operating system and hardware in use, which helps explain why practical file sizes tend to be far smaller than the absolute maximums. The host wraps by hinting that ongoing advancements in storage technology and file system design could change the landscape, but that for now, the 17.5 TB OS cap on Windows 10 is the most tangible boundary for end users.

Topics · science and technology · data storage · file systems · hardware storage