📁Basic Control / Function Keys

Overview of hardware keypad controls and shortcut functions for IODD devices.

IODD ST300/400, MINI PRO, MINI (Legacy)

The physical keypad on your IODD allows for quick navigation and advanced power-user shortcuts. Understanding these keys will significantly improve your workflow.

1. Basic Control (Press Key Once)

⌨️ For Models with Keypad (ST300/400, MINI PRO, MINI, LK100)

Key	Function	Description
[1]	Rescan	Rescans the root folder for new files.
[2]	Up	Moves up in the file or item list.
[3]	Voltage	Displays the VBUS minimum voltage (Crucial for stability).
[4]	Back	Goes to the parent folder.
[5]	Info	View detailed file information (size, fragmentation, etc.).
[6]	Select	Selects a file to mount or enters a folder.
[7]	Eject	Ejects the most recently mounted virtual drive.
[8]	Down	Moves down in the file or item list.
[9]	Save	Saves the current mount state (Auto-mounts on next boot).
[M]	Menu	Enters or exits the system settings menu.
[0]	Help	Accesses the built-in Help menu or active error details.
[Enter]	Select	Same function as Key [6].

2. Advanced Hotkeys (Long Press - 3 Seconds)

For the ST300/400, MINI PRO, MINI (Legacy), holding a key for 3 seconds triggers advanced maintenance functions:

Key	Function	Description
[1]	Reconnect	Restarts the USB connection without physical removal.
[3]	WP Reconnect	Reconnects with Write-Protection enabled for all drives.
[4]	Partition List	Displays all partitions; allows manual selection of the default data partition.
[7]	Detach All	Reconnects with all virtual drives (ISO/VHD/IMA) unmounted.
[9]	Sleep Mode	Safely detaches the USB connection and enters power-saving sleep mode.
[0]	Temp Disable WP	Reconnects with Write-Protection temporarily disabled.

3. Startup Keys (Hold while connecting USB)

These keys must be held before and during the insertion of the USB cable:

Key	Mode / Function	Description
[1]	Factory Reset	Resets all settings (LCD bright, standby time, etc.) to defaults.
[3]	WP Mode	Starts the device in a global Write-Protected state.
[5]	Standalone	Operates the IODD using external power without a PC connection.
[7]	Unmount All	Ensures no virtual drives are loaded upon startup.
[M]	Standalone Menu	Enters the system settings menu in Standalone Mode.
[0]	Key Info	Displays a list of available startup keys on the screen.
[9] + [Enter]	Firmware Recovery	Force Recovery: Hold both keys for 7s to re-flash the current firmware.

🔘 For IODD 2531 (Jog Dial)

• Jog Up/Down: Moves the cursor through the file list or menu items.

• Jog Click (Center): Selects a file or enters a folder.

• Back Button (Side): Moves to the parent folder or exits the current menu.

👆 For IODD 2541 (Touch Keys)

The 2541 features a 12-button capacitive touch interface. Operation is identical to the physical keypad models, but requires a light touch rather than a press.

• [2] / [8]: Up / Down navigation.

• [6] / [Enter]: Select / Mount.

• [4]: Back / Exit.

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Correct Startup Sequence

1. Hold the desired key firmly.

2. Plug in the USB cable.

3. Release the key once the IODD logo appears.

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Terminal Verification

# Monitor kernel messages for USB reconnects/errors
$ dmesg -w | grep -i usb