I found a solution for disk failure.
On the dashboard’s navigation panel, click Settings, then click the Storage tab. Review Drive A and Drive B to determine which drive is faulty.
If one of the drives has Failed or Storage Failed?, and note the letter of the drive (for example, Drive A).
In the event a fault occurs and you would like to service the device yourself, visit WD Technical Support at http://support.wdc.com and search the Knowledge Base Answer ID 8644 ( http://wdc.custhelp.com/app/answers/detail/a_id/8644/session/L3RpbWUvMTM1NDg2MTAxNy9zaWQvMmlsVGE3ZGw%3D) for detailed instructions on obtaining a replacement drive.
Then it is necessary the physical replace the hard drives.
Reconnect all of the cables for the device.
The drive starts the rebuild process automatically. The RAID rebuild may take up to 15 hours depending on drive capacity and activity, but typically will complete in 7 to 12 hours. Allow the RAID rebuild to complete.
Important: Do not attempt to use the device during the rebuild process.
Once the RAID rebuild is complete, the LEDs will glow steadily to indicate power-on state.
Important: Only WD large capacity hard drive assemblies can be inserted into the My Book Live Duo drive enclosure. Visit http://support.wdc.com and search the Knowledge Base Answer 8644 for detailed instructions on obtaining a replacement drive for this product. Use only WD hard drive assemblies or your warranty will be voided.
If the drive is not under warranty, or you wish to purchase a drive as a spare, be sure to get a drive that uses an identical model number to the drives included in your enclosure. This includes the information in the suffix of the model number (for example if the model number was WDM0D31NUM83R-0000 both the the WDM0D31NUM83R and 0000 numbers should be identical.)
MY E-mail to support office in WD.
Thank you for contacting Western Digital Customer Service and Support. My name is Patrik.
In response for your questions:
You should always use the same model of drive as is the second drive in your device. Using different model of the drive, or the same model, but with the larger capacity may destroy all data on the drive. If one of the drive failed, and the same model is no longer available on the market, you should replace both drive with the same model. MyBook Live Duo supports only WD Green drives. But these drives are still quite new, they will be available on the market for couple of years.
If you set the RAID1 configuration, you just need to replace the defective drive with the new unformatted drive and the MyBook will restore all data automatically.
Data are not encrypted on the drive, so you can connect it directly to your computer, but you need to use some Linux distribution in order to access the data (drives are formatted to the Linux file system - ext3) or some third party ext3 viewer. If you have any further questions, please reply to this email and we will be happy to assist you further. Sincerely,
Patrik Western Digital Service and Support