MY BOOK THUNDERBOLT DUO
USER MANUAL
ABOUT YOUR WD STORAGE DEVICE – 4
Power/Activity LED
The power/activity LED shows the device’s normal power state and activity, and
provides caution/warning indications as follows:
Note: If you see an over-temperature indication, power down the device and let it
cool for 60 minutes. Power it back on, and if the problem persists, contact
WD Support.
Thunderbolt Ports
As shown in Figure 2 on page 3, the My Book Thunderbolt Duo dual-drive storage
device has two dual-channel Thunderbolt ports that provide a fast, flexible interface for:
• Performance—Thunderbolt technology delivers unprecedented data transfer
rates thanks to its revolutionary bidirectional I/O throughput. Each Thunderbolt
port provides two bidirectional channels, each with theoretically up to 10 Gb/s of
bandwidth.
• Simplicity—Thunderbolt technology supports daisy chaining multiple devices
through a single Thunderbolt connector so you can multitask at Thunderbolt
technology speed without having to use a switch or hub. This reduces the
hardware clutter and increases productivity.
• Flexibility—Connect additional Thunderbolt technology-enabled external hard
drives, media players, HD displays, media capture and editing systems and more
through a single connector.
Note: Your My Book Thunderbolt Duo device must be connected to a Mac computer that
supports Thunderbolt technology. For information about cables that support
Thunderbolt technology, visit
http://support.wdc.com.
LED Appearance Power State/Activity
Normal Operating Indications
Brief fast-flash display of white-amber-white-
amber-white-amber-off, less than one second
in duration
Initial power-on sequence
White, on steady Ready, interface enabled, but idle
White, continuous fast flashing,
approximately four times per second
Active
Off No power, no interface connection, or sleep
status
Caution/Warning Indications
Amber, on steady Fan failure or over-/under-temperature
condition
Amber, slow flashing, approximately two
times per second, every other second
At or above critical temperature
