> For the complete documentation index, see [llms.txt](https://help.iodd.kr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.iodd.kr/product-reference-wiki/vhd-tool-plus-plus.md).

# VHD Tool++

## 1. Overview

**VHD Tool++** is a specialized utility designed to manage virtual disk images for IODD devices. This program is designed exclusively for **Windows environments**. Beyond standard Virtual CD-ROM booting, IODD supports Virtual USB Flash Drive and Windows-To-Go (WTG) booting through the use of VHD files.

### Key Capabilities

* **Virtual Drive Emulation**: Supports up to 6 virtual devices simultaneously.
* **Drive Type Selection**: Categorizes virtual drives into four distinct types: **Fixed**, **Removable**, **Floppy (FDD)**, and **Optical (ODD)**.
* **Multi-Language Support**: Available in English, Korean, and Chinese. The English interface can be launched directly using the `VHD_Tool++(en).bat` file.

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## 2. Screenshots

![VHD Tool Screenshot 1](/files/pdBGHOAwgeM87d1gIcpq) ![VHD Tool Screenshot 2](/files/P1VUZwYuP9dKHmRp7u8k) ![VHD Tool Screenshot 3](/files/dYIo4JmpdOO9VbcWAGew) ![VHD Tool Screenshot 4](/files/TXBPvm8dgo4fTHjgQ1qq) ![VHD Tool Screenshot 5](/files/eJkJzFGXIy82TQ3yWvj4) ![VHD Tool Screenshot 6](/files/NxkeC7oetZ5DCrk4EYlv)

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## 3. Core Functions

### Create

Instantly creates fixed-size VHD files directly on the IODD drive. This process is highly optimized to ensure files are **completely unfragmented**, which is critical for successful mounting on IODD devices.

### Convert

Converts standard raw disk dump images into the fixed-size VHD format compatible with IODD.

### Extend

Allows users to increase the capacity of an existing fixed-size VHD file without compromising stored data.

### Defragment

Analyzes and defragments individual files on the IODD to ensure they meet the zero-fragmentation requirement for virtual drive functionality.

### Upload

A specialized transfer function that copies files from a PC to the IODD while actively preventing fragmentation during the write process.

### Write To HDD (Expert Only)

Performs a physical, sector-by-sector clone of an image file directly to a hard drive.

* **Support**: Currently supports NTFS only.
* **WARNING**: This is an advanced feature. **All existing data on the target drive will be permanently erased.**

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## 4. Enhanced Features for Legacy Models (IODD 2531 / 2541)

Legacy IODD models utilize specific filename conventions to control drive behavior and hardware-level write protection.

### Filename Extensions

* `.VHD`: Mounted as a **USB Fixed Drive**.
* `.RMD`: Mounted as a **USB Removable Drive**.

### Write-Protection Tags

By appending specific tags to the filename (e.g., `Win2Go&DW.VHD`), you can define the default connection mode:

* **Standard Name** (e.g., `Win2Go.VHD`): Defaults to CD-MODE or ODD-MODE (on 2541).
* **`&D` Tag** (e.g., `Win2Go&D.VHD`): Defaults to **Dual-Mode**. The physical HDD is hardware **Write-Protected**.
* **`&DW` Tag** (e.g., `Win2Go&DW.VHD`): Defaults to **Dual-Mode**. The physical HDD is **Write-Enabled**.

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## 5. Getting Started

### Installation

1. Download the latest ZIP package.
2. Extract the ZIP archive to a local directory.
   * *Tip: For maximum compatibility, use a directory path that uses English characters and contains no spaces.*
3. Execute `VHD_Tool++.exe` or use the provided `.bat` file for specific language settings.

### Version History

* **v0.7.0.10 (2021-07-29)**: Added comprehensive support for NTFS, exFAT, and FAT file systems.
* **v0.6.0.5 (2015-06-20)**: Introduced initial support for NTFS.

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## 6. Resources

* [Official IODD Virtual Drive Guide](https://help.iodd.kr/bootable-virtual-drive/virtual-drive-vhd)

## 7. Download

* [VHD TOOL++ Download](https://dir.iodd.kr/vhd_tools)