Format Disk Tool
A small, free Windows utility that formats disks and USB drives as FAT16, FAT32 or NTFS through a simple graphical interface - with built-in safety guards so you don't accidentally format the wrong disk.
The tool runs today straight from source (PowerShell + Windows Forms). A code-signed installer (.exe) is being released via GitHub Releases.
What the tool does
- Formats a selected disk or USB drive as FAT16, FAT32 or NTFS via a simple graphical interface.
- Automatically hides the system/OS drive - you cannot format the disk Windows runs from.
- Requires administrator rights and prompts for UAC elevation on startup.
- Double confirmation before formatting: yes/no warning + manual entry of the drive letter.
- FAT16 on volumes over 4 GB: offers to create a 3.9 GB FAT16 partition instead of just blocking.
- Optional volume label (max 32 chars) and quick-format toggle.
- Marquee progress bar and a "Done" message - formatting runs as a background job so the UI stays responsive.
How to use it
- Select a disk from the dropdown (the system drive is not shown).
- Choose a format: FAT16, FAT32 or NTFS.
- Optionally enter a volume label (max 32 chars).
- Toggle Quick format on or off (off = full format, slower, zeroes the whole disk).
- Click FORMAT.
- Confirm twice: yes/no warning + type in the drive letter.
Start the program by double-clicking Start-FormatDiskTool.bat (or right-click FormatDiskTool.ps1 → "Run with PowerShell"). The program automatically requests administrator rights - accept the UAC prompt.
Safety guards
The system drive (C: etc.) is always excluded and cannot be selected.
The tool requires administrator rights and prompts for UAC elevation.
Double confirmation: a warning plus manual entry of the drive letter before anything is deleted.
FAT16 over 4 GB: instead of just blocking, the interface offers to create a 3.9 GB FAT16 partition (the rest of the disk is left unused).
File system limits in Windows
| Format | Max volume | Max file size | Note |
|---|---|---|---|
| FAT16 | 4 GB | 2 GB | Only small volumes / older devices |
| FAT32 | 32 GB* | 4 GB | *Windows refuses to format above 32 GB |
| NTFS | 256 TB+ | ~16 TB | Standard for large disks |
FAT32 on volumes over 32 GB requires third-party tools - Windows' built-in formatting (which this tool uses) does not support it.
System requirements
- Windows 10 or Windows 11
- Administrator rights (the tool requests this itself)
- Windows PowerShell (ships with Windows) - no extra installation needed
Warning
Formatting permanently deletes everything on the selected volume. Make sure you have selected the right disk before you confirm. Datafolka is not responsible for data loss caused by misuse.
Version and changelog
1.0.0 - planned first release
- Graphical interface for FAT16/FAT32/NTFS formatting.
- Safety guards: system drive excluded, administrator required, double confirmation.
- FAT16-over-4 GB handling with a 3.9 GB partition offer.
- Quick format, volume label and a background job with progress bar.
A code-signed installer (.exe) follows once SignPath signing is in place.
Free to download and use
Format Disk Tool is open source under the MIT license - free to download, use and modify. All source code is openly available on GitHub.