> 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/bootable-virtual-drive/mode-configuration.md).

# Mode Configuration

Mode Configuration controls how the PC recognizes your IODD device: physical HDD, virtual ODD for ISO files, and virtual VHD/IMA/RMD drives. Use this page to enable or disable device types, change drive order, and set fixed/removable or write-protected behavior.

{% hint style="warning" %}
Ensure that your disk drive is properly initialized before proceeding. [Drive Setup Guide](/bootable-virtual-drive/drive-setup.md)
{% endhint %}

***

## How to Enter Mode Setting

1. Press the **`Menu`** (or **`*`**) button.
2. Navigate to and select **\[Mode setting]**.

|                                                        |                                                             |
| :----------------------------------------------------: | :---------------------------------------------------------: |
| ![IODD mode setting menu](/files/NnmTUTBDtDX5wQeWv2mM) | ![IODD mode setting item list](/files/b6cPK2pINOCPJTibH5ZZ) |

***

## Item Descriptions

| Item    | Description                                                                                                                                                                     |
| ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **HDD** | The internal physical drive of the ST400/LK100/MINI PRO.                                                                                                                        |
| **ODD** | <p>Virtual Optical Disc Drive (CD/DVD/Blu-ray) used for mounting <strong>ISO</strong> files.<br><em>Note: ODD is always write-protected; manual toggle does not apply.</em></p> |
| **VHD** | Virtual drive used for mounting **VHD/IMA/RMD** files. It can act as a removable/fixed drive or a USB memory stick.                                                             |

***

## Mode Setting Controls

|      Key      | Function          | Description                                                                |
| :-----------: | ----------------- | -------------------------------------------------------------------------- |
| **`2` / `8`** | **Move Cursor**   | Moves the cursor (▶) **Up** and **Down** to select a drive.                |
| **`3` / `9`** | **Change Order**  | Moves the selected item's **priority order** (▶) Up and Down.              |
|    **`5`**    | **Write Protect** | Toggles **Write Protection** (On/Off) for the selected drive.              |
|    **`6`**    | **Drive Type**    | Toggles the selected drive's property between **Fixed** and **Removable**. |

{% hint style="warning" %}
**Disabling Items:** Items placed below the **\[----------Disable-----]** line will be deactivated. Use the **`3`** or **`9`** keys to move unwanted items below this line.
{% endhint %}

***

## Configuration Example

![IODD mode configuration example](/files/NGPDgdlKhzL3ehsBbR19)

If configured as shown in the image above, the PC will recognize the following devices:

1. **Physical HDD**
2. **Virtual ODD Drive**
3. **Removable Writable USB Drive**

***

{% hint style="warning" %}
**Error: \[No Extra Devices]** If you attempt to mount an ISO or VHD file and receive this message, it means no virtual drive (ODD/VHD) is currently active. **At least one virtual drive must be enabled in the Mode Setting menu.**
{% endhint %}

***

## Saving and Next Steps

Once you have finished your configuration, press the **`Menu`** (**`*`**) key to **save**. The IODD will automatically reconnect, and your new settings will be applied.

* **To mount an ISO file:** Proceed to [Virtual ODD (ISO) Guide](/bootable-virtual-drive/virtual-odd-iso.md).
* **To use Virtual USB/HDD:** Learn how to [Create VHD files with VHD Tools](/bootable-virtual-drive/virtual-drive-vhd/create-vhd-file-with-vhd-tools.md).