In our daily computer usage, we often need to copy large files to USB drives for portability or data transfer. However, when you try to copy a file larger than 4GB to a USB drive, the system may display an error message like "File too large" or "The file is too large for the target file system", causing the copy operation to fail. This situation usually occurs because the USB drive uses FAT32 format - while this format has good compatibility, it has a limitation that single files cannot exceed 4GB. However, this problem is not unsolvable. This tutorial will provide a detailed analysis of the root cause of this problem and offer multiple practical solutions to help you easily solve the issue of files too large to copy to USB drives.
To understand this problem, you first need to know about the file system of USB drives. Most USB drives are pre-formatted to FAT32 by default, which is a legacy file system with good compatibility but has two key limitations:
When the file size you are transferring "hits" this 4GB limit, the system will give an error message. This problem is not limited to USB drives - all storage devices using FAT32 file system (such as memory cards, older external hard drives) will encounter the same issue.
NTFS (New Technology File System) is the default file system for Windows. If you need to copy files larger than 4GB to a USB drive, formatting the USB to NTFS is the most straightforward solution.
👍Advantages of NTFS Format
Formatting Steps:
⚠️Preparation: Please be sure to back up all important data on the USB drive. Formatting will erase all files on the USB drive!
Step 1. Connect the USB drive to your computer, open "This PC", right-click the USB drive letter, and select "Format" from the menu.
Step 2. In the format window, click the "File system" dropdown menu and select "NTFS".
Step 3. Other option settings recommendations:
💡Tips: Checking "Quick format" only takes a few seconds to complete, suitable for daily use. Unchecking it will perform a full sector scan and check, which takes a long time (possibly several hours). You don't need to uncheck it unless you suspect the USB drive has physical bad sectors.
Step 4. After confirming the settings are correct, click the "Start" button.
Step 5. The system will display a warning that formatting will erase all data. After confirming again that the USB data has been backed up, click "OK" to start formatting.
Step 6. After formatting is complete, the system will display a prompt. Click "OK" to close the dialog. Your USB drive is now converted to NTFS file system and can copy files of any size.
💡Tips: NTFS-formatted USB drives may not be recognized by some devices (such as certain TVs, stereos, car players, etc.) because these devices typically only support FAT32 file system. If you need to use on these devices, please choose another solution.
exFAT (Extended File Allocation Table) is a file system specially designed by Microsoft for flash devices (such as USB drives, SD cards). It cleverly balances the wide compatibility of FAT32 with the large file support of NTFS, making it the best choice for cross-platform large file transfers.
🎯Core Advantages of exFAT:
Formatting Steps:
Step 1. Open "This PC", right-click the USB drive letter, and select "Format" from the menu.
Step 2. In the popup window, select "exFAT" from the "File system" dropdown menu.
Step 3. After confirming everything is correct, click the "Start" button to execute the formatting.
💡Tips: Windows Vista and later natively support exFAT. Windows XP requires an update patch to recognize exFAT file system. macOS: 10.6.5 and later natively support exFAT. Linux: Modern mainstream distributions (such as Ubuntu) have native kernel support. Older versions may need to install exfat-fuse driver.
If you don't want to format the USB drive (because you need to use it on other devices), or the USB drive already contains important data that cannot be easily formatted, you can use file splitting tools to split large files into multiple smaller files, copy them to the USB drive, and then merge them.
Using WinRAR to Split Files
If you have WinRAR installed, you can follow these steps to split files:
Step 1. Right-click the large file you want to split and select "Add to archive".
Step 2. In the compression window, find the "Split to volumes" option at the bottom left.
Step 3. Enter the size for each volume (for example, enter 2000M for 2000MB, or 2G for 2GB), then click "OK" to start compressing and splitting.
Step 4. After splitting is complete, copy all generated volume files (usually named filename.part1.rar, filename.part2.rar, etc.) to the USB drive.
Step 5. On the target computer, put all volume files in the same folder, right-click the first volume (.part1.rar), and select "Extract to current folder" or "Extract to..." to restore the complete file.
💡Tips: WinRAR will automatically recognize and process all volumes in sequence. You don't need to manually select multiple files.
If your files are of highly compressible types (such as documents, spreadsheets, text files, database files, etc.), compressing can significantly reduce the file size. If the compressed size is less than 4GB, you can successfully store it in a FAT32-formatted USB drive.
Operation Steps:
Step 1. While Windows' built-in "Send to > Compressed (zipped) folder" is convenient, its compression rate is limited. It is recommended to install WinRAR or 7-Zip for better compression results.
Step 2. In the compression settings interface:
Step 3. After compression is complete, check the generated file size. If it's less than 4GB, you can directly copy it to the USB drive. If it's still larger than 4GB, the file has limited compression space. You may need to refer to other solutions in this guide.
💡Tips:
When conventional copy methods (such as drag-and-drop, Ctrl+C/V) experience stalling, errors, or interruption when handling very large files (over 4GB), you can use Windows' built-in professional copy tool - robocopy (powerful file copy command):
Step 1. Press Win + S, type "cmd". Right-click "Command Prompt" and select "Run as administrator".
Step 2. Enter the following command to copy:
robocopy "source folder path" "destination folder path" filename /z /mt:8 /r:3 /w:5
💡Tips:
Step 3. Wait for the copy to complete. After copying, the command line will display summary information including the number of files copied, failed files, etc.
After understanding the various file systems, how do you choose the one that suits you? Here is a comparison of three common file systems:
| Feature | FAT32 | exFAT | NTFS |
| Maximum single file | 4GB | 16EB (theoretically unlimited) | 256TB (theoretically unlimited) |
| Maximum partition | Windows format tool limits to 32GB | 128PB (theoretical value) | 256TB |
| Device compatibility | Best (almost all devices support natively) | Good (widely supported by modern devices, older devices may not be compatible) | Poor (Windows native support, macOS read-only, Linux needs drivers, gaming consoles/TVs mostly not supported) |
| Impact on flash lifespan | Average (frequent writes can cause USB/SD card wear) | Excellent (optimized for flash, reduced write amplification, extends lifespan) | Poor (journaling design produces extra writes, not suitable for cheap USB drives) |
| File encryption | Not supported | Not supported | Supports BitLocker and EFS encryption |
| Journaling | None | None | Yes (high data security, less likely to be damaged during power outages) |
❤️Selection Recommendations:
The inability to copy large files to USB drives is usually due to the USB drive using FAT32 file system, which has a maximum single file capacity limit of 4GB. This tutorial has provided a detailed analysis of this issue and multiple effective solutions. You can choose the appropriate solution based on your specific usage scenario and device situation. Additionally, if you need more powerful data backup and recovery features beyond large file transfer, you may want to learn about Hasleo Backup Suite professional backup software for a more comprehensive data management experience.
