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====== LED Power Button ======

Your LaCie hard drive features a multi-functional LED on the front of the drive.

===== LED states =====

^ LED Behavior ^ State ^
| Off | The product is turned off; the USB cable is not connected to a computer that is turned on and/or the power cable is not connected to a live power outlet. |
| 30s off, flash blue, 30s off, etc. | The product is in power-saving mode due to one of the following: its volumes have been unmounted on the host computer; the host computer placed it into sleep mode; or, the host computer is in sleep mode. See Technical info below. |
| Solid blue | The product is turned on and the hard drive is ready for access. |
| Flickering | During normal operation, the LED flickers to indicate access to the hard drive. |

<note technical>**Technical note regarding power-saving mode and Windows:** The LaCie d2 can be placed into power-saving mode on PC’s running Windows 8 or higher. However, it is possible that the LED will remain off rather than flash blue every 30 seconds.</note>

==== Receiving power ====

The LaCie d2 powers on automatically when it is:
  * Connected directly to a computer via the Thunderbolt 2 or USB ports. The computer must be powered on.
  * Connected to a live power source via the included power supply.

<note important>**Important info regarding the ports:** The LaCie d2 can be connected to a computer using the USB 3.0 port or the Thunderbolt 2 port. However, it is not possible to connect both ports to a single computer at the same time or, to connect each port to separate computers.</note>
 
<note technical>**Note on the USB 3.0 connection:** The LaCie d2 can be connected to a USB 2.0 port on your computer. To take advantage of SuperSpeed USB 3.0 transfer rates, you must connect the enclosure to a computer with a USB 3.0 port.</note>

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===== LED button =====

The LED is a button that can be used to power off/on the LaCie d2. 

==== Power off ====
Follow the steps below to turn the device off:
  - Make certain that the LaCie d2’s volumes are not being accessed.
  - Eject the LaCie d2’s volumes. See [[unmounting|]] for instructions. Once the volumes have been properly ejected, the LaCie d2 enters power-saving mode.
  - Apply a long press, a minimum of four seconds, to the LED button. The LED turns solid blue before turning off.

==== Power on ====
In most instances, the LaCie d2 powers on automatically when connected to a computer and an active power source. However, the LED button can be used to power on the device if the following two conditions are met:
  * The LaCie d2 was powered off using a long press
  * The LaCie d2 remains connected to the computer’s USB port and an active power source

To power on the LaCie d2, push the LED button for one second.

==== Power-saving mode (Thunderbolt 2 connection only) ====
Your LaCie d2 can conserve energy by entering power-saving mode. The hard drive within the enclosure spins down to reduce power consumption when the LaCie d2 is in power-saving mode. Power-saving mode can extend the life of the hard drive by sparing it from working during extended periods of inactivity. The LaCie d2 can be placed into power-saving mode using the LED button when it is connected via the Thunderbolt 2 port. To place the LaCie d2 into power-saving mode:
  - Make certain that the LaCie d2’s volumes are not being accessed.
  - Eject the volumes (see [[unmounting|]]).
  - Apply a short press to the LED button. A short press lasts no longer than 1 second.

To wake up the LaCie d2, apply another short press.

=== Power-saving mode: daisy chain ===
You can daisy chain Thunderbolt 2 technology and first generation Thunderbolt technology devices when the LaCie d2 is in power-saving mode. Though the hard drive spins down when the LaCie d2 enters power-saving mode, the Thunderbolt 2 signal remains constant. Therefore, daisy-chained devices continue data operations without interruption. See [[daisy-chain|]] for further details.

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==== Power-saving mode: managed by the PC/Mac ====

You can initiate power-saving mode on your computer by performing one of the following:
  * Place the host computer into sleep mode.
  * **Mac:** Go to **System Preferences > Energy Saver** to enable sleep mode for hard drives.
  * **Windows 8:** Go to **Control Panel > Hardware > Power Options > Choose a power plan > Change advanced power settings**. Click on **Hard disk** and **Turn off the hard disk after**. Choose the time to spin down USB hard drives.

To exit power-saving mode, review the table below:

^ Entering power-saving mode ^ Exiting power-saving mode ^
| The host computer placed the product into power-saving mode due to inactivity. | Access the LaCie d2’s volume on the host computer. For example, copy files to its volume. |
| The computer is in sleep mode. | Wake up the computer. |

<note>**Note on ejecting the volume and power-saving mode:** The LaCie d2 enters power-saving mode when its volumes are ejected. To access the LaCie d2’s volumes, unplug the USB cable from the back of the device and reconnect it.</note>