📁Basic Control / Function Keys

IODD keypad controls, shortcut keys, hotkeys, and startup key functions for ST400, ST300, MINI PRO, MINI, LK100, 2531, and 2541.

The physical keys on IODD devices control file navigation, ISO/VHD mounting, write protection, safe removal, voltage checks, and firmware recovery. This guide covers keypad models such as ST400, ST300, MINI PRO, MINI, LK100, plus legacy 2531 jog dial and 2541 touch key operation.

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