> 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/troubleshooting/iodd-drive-initialization.md).

# IODD Drive Initialization

Before using your IODD, the internal drive must be partitioned and formatted correctly in Windows, macOS, or another operating system. This troubleshooting guide focuses on MBR/GPT selection, NTFS/exFAT formatting, safe removal, and refresh steps after copying ISO or VHD files.

For the full first-time setup order, including when to set AES256 encryption before formatting, see [IODD Disk Initialization](/disk-initialization.md).

## 1. Initialize the Disk

Connect the IODD to your PC and initialize the drive using your operating system's disk management tool.

* **Modern Models (ST, MINI PRO, LK100):** Supports both **MBR** and **GPT**. GPT is recommended for drives over 2TB.
* **Legacy Models (2531, 2541, MINI Legacy):** Supports **MBR only**. GPT is **not supported** (Legacy models have a hardware limit that only recognizes the first **2TB** of a drive).

### Partition Styles

* **MBR (Master Boot Record)**: Best for maximum compatibility with legacy BIOS systems. Required for all legacy IODD models.
* **GPT (GUID Partition Table)**: Recommended for modern UEFI-based systems and drives larger than 2TB (Modern models only).

{% hint style="info" %}
**Fixing Initialization Failures (MBR → GPT → MBR Trick)** If the drive fails to initialize or displays errors, try this cycle:

1. Connect the HDD/SSD directly to a PC (if possible) or via IODD.
2. Initialize it as **GPT**.
3. Then, immediately re-initialize it back to **MBR**. This process can often clear corrupted partition table metadata that simple formatting cannot fix.
   {% endhint %}

{% hint style="danger" %}
**For Encryption Users** If you plan to use AES256 encryption, you must first set a new 2nd Password via the Admin menu. After setting the password, you **must repeat the initialization process**, as the hardware encryption changes the disk structure.

* Refer to: [2nd Password Setup Guide](/aes256-encryption-mini-pro-st-lk/admin/2nd-password.md)
  {% endhint %}

***

## 2. Formatting Partitions (Recommended File Systems)

For the best experience with IODD, we highly recommend using either **NTFS** or **exFAT**. Both support large files (over 4GB) and are fully compatible with IODD tools.

| File System | Best For                         | Key Advantages                                                                         |
| ----------- | -------------------------------- | -------------------------------------------------------------------------------------- |
| **NTFS**    | **Windows-centric environments** | Highly stable, supports journaling (error recovery), and is the native Windows format. |
| **exFAT**   | **Cross-platform use (Mac/Win)** | Excellent compatibility between macOS and Windows without file size restrictions.      |
| **FAT32**   | ❌ **Not Recommended**            | **4GB file size limit** and **Incompatible with VHD Tool++**.                          |

{% hint style="warning" %}
**Comparison: NTFS vs. exFAT**

* Both file systems are **fully supported by VHD Tool++** and IODD's virtual drive functions.
* Choose **NTFS** if you primarily work on Windows and need robust data recovery features.
* Choose **exFAT** if you frequently move the IODD between Windows and Mac computers.
  {% endhint %}

***

## 3. File Transfer and Safe Removal

1. **Copy Files**: Transfer your ISO, VHD, or document files to the IODD drive.
2. **Safely Remove**: This is **essential** for both NTFS and exFAT to prevent filesystem corruption.
   * Use the "Safely Remove Hardware" icon in your system tray before physical disconnection.

***

## 4. Reconnection and Refreshing

After reconnecting the IODD, the screen should display your updated file list.

{% hint style="info" %}
**Manual Refresh (Force Scan)** If the file list on the IODD screen does not match what you copied:

* **Modern Models (ST, MINI PRO, LK100):** **Hold the \[4] key for 3 seconds**. This forces a re-scan and allows you to manually select the correct partition if multiple are present.
* **Legacy Models (2531, 2541, MINI Legacy):** Manual partition selection via hotkey is **not supported**.
  * For **2541/MINI**, long-pressing **\[4]** only rescans the current folder.
  * For **2531**, long-press **Jog Up** to rescan.
    {% endhint %}

***

## Technical Verification

You can check the partition status and file system type using the following command:

```bash
    # On Windows (PowerShell), check partition and filesystem info
    $ Get-Volume | Where-Object {$_.DriveLetter -ne $null} | Select-Object DriveLetter, FileSystem, Size, HealthStatus
```