Western Digital's My Book Studio Edition II is an external hard drive that uses two drives, pre-configured as a fast RAID 0 (striped) array. Our test unit came with two 500GB WD Green Power drives (which use up to 30 percent less power than standard drives) striped as a 1TB volume. A version with two 1TB Green Power drives is also available.
The Western Digital My Book Studio Edition II unit boasts a quad interface, but in reality it only has three types of onboard connectors-two FireWire 800 ports, one mini USB 2.0 port, and one eSATA port. If your PC doesn't have FireWire 800 ports, the drive ships with a special cable with a FireWire 800 connector on one end and a FireWire 400 connector on the other end.
The Western Digital My Book Studio Edition II ships formatted for the Apple Mac, using HFS+ with journaling. If you want to share this drive with a PC, you'll need to reformat it to FAT32, a Windows-friendly format that the Mac can read and write. Also, if you want to boot from an Intel Mac, you'll need to go in and change the partition to use GUID Partition Map instead of the default Apple Partition Map that works with PowerPC-based Macs.
If you don't want to use the My Book SE II as a RAID 0 array, you can't reformat the drives into two separate drives or a mirrored array. You'll have to install the included WD Drive Manager software and use its tools. At comparable capacities, striped RAID arrays are faster than a single drive, since such an array uses two heads to read and write across both drives at the same time. The downside is that if one of the two drives fails, you lose all of your data.
A mirrored array (RAID 1) offer greater protection against drive failure by maintaining one drive as an exact duplicate of the other. If one drive fails, all of your data in your RAID 1 array is safely backed up.
We tested and rated the My Book Studio Edition II in its default RAID 0 configuration.
The My Book Studio Edition II is 171mm tall and 102mm wide, quite a bit bigger than most books. It features a long, thin, vertical, glowing activity bar with six lights that pulsate and move up and down or flash, based on whether the drive is busy, idle, or malfunctioning. This bar can also give you a visual representation of your remaining drive capacity. Each light represents about 17 percent of your storage capacity, so if three of them are lit, you've used about half of your storage space.
In terms of speed, the My Book Studio Edition II definitely gets a boost from its RAID 0 configuration, beating out Western Digital's My Book Studio Edition in our low-memory Photoshop tests, as well as the eSATA file duplication tests. Copy tests for the two My Book drives yielded near-identical results.