Your storage system has the following boot modes:
• Normal. Initiates a normal boot process, just like booting using the Power button.
• Factory default. Initiates a short disk test that takes approximately 5 minutes. After the disk test, a 10-minute time-out period begins. During the 10-minute time-out period, you can choose to power off the storage system without causing any data loss, and the factory default process is canceled. If you choose not to power off the storage system, after the 10-minute time-out period, the factory default process begins.

     o WARNING: The factory default reboot process resets the storage system to factory settings, erases all data, resets all defaults, and reformats the disk to X-RAID2.
     o Tip: To start the factory default process immediately, press the Reset button during the 10-minute time-out period.

• OS reinstall. Reinstalls the firmware from the internal flash to the disks. Use the OS reinstall boot mode when the system crashes and corrupts some configuration files. OS reinstall boot mode also resets some settings on your storage system, such as Internet protocol settings and the administrator password, to defaults.
• Tech support. Boots into a low-level diagnostic mode. Use the tech support boot mode only when instructed to do so by a NETGEAR technical support representative.
• Volume read only. Mounts a volume as read-only. Use this option when you are attempting to rescue data off a disk during a disaster recovery.
• Memory test. Performs a memory test. The pass or fail result is reported using the storage system's LEDs. Contact a NETGEAR technical support representative to interpret memory test results.
• Disk Test. Performs an offline full disk test. This process can take four hours or more, depending on the size of your disks. Any problems are reported in the system logs. For more information about viewing the system logs, see the ReadyNAS OS 6 Software Manual, which is available at http://support.netgear.com/product/ReadyNAS-OS6.

Before accessing the boot menu, refer to the images below to become familiar with the LEDs and the instrument panel on your system.
 

On the front bottom of the RR4360, there are three red LEDs.  On the right side, there is an instrument panel.

From top to bottom, Power LED, Gigabit Ethernet LAN port indicator, 10 Gigabit Ethernet LAN port indicator, System Alert indicator, Power Button, Reset Button, and USB port.

To access the boot menu:
1. Power off your system.
2. Press and hold the Reset button.
3. Press the Power button.
The system powers on.
4. Continue to press the Reset button until the three front LEDs blink.
Note: it can take approximately 90 seconds for the system to enter the boot menu.
5. Press and release the Reset button to scroll through the boot menu modes.

Legend:

6. Press and hold the Reset button for 5 seconds to confirm your boot menu selection.