No drives. With original power supply.

The WD My Book Thunderbolt Duo is a high-quality external hard drive that offers a storage capacity of 4 TB. It is compatible with both PC and Mac devices and features a dual-drive design, making it perfect for storing large files and folders. The unit has a grey and black colour scheme and comes with a FireWire 800, eSATA, and USB interface for easy connectivity.

In addition, the WD My Book Thunderbolt Duo has a 7200 RPM rotation speed and a varying transfer rate, depending on the file type. It also includes features such as duplication, removable storage, time machine compatibility, and an indication light. The unit supports HDD drive types and has a form factor of an external RAID drive. This product is perfect for those who require a high-capacity storage solution that is both reliable and versatile.