The chassis is looks similar to the Western Digital My Book Thunderbolt Duo and the Western Digital My Book Studio ($399.97 at Amazon) (Opens in a new window), aside from the two status LEDs for the dual hard drives. Read our editorial mission (Opens in a new window) & see how we test (Opens in a new window). Since 1982, PCMag has tested and rated thousands of products to help you make better buying decisions. This is a little disappointing, because Seagate drives come with a NTFS driver for the Mac that lets you use them with both Macs and Windows PCs without reformatting (for example, if you need to quickly transfer data between systems in a mixed office). The drive will work with Macs, so long as you reformat the drive to HFS+. The default RAID 0 setting gives the best performance, so that's how we tested the drive. That way if one fails, you still have the second copy to work with. In a RAID 1 configuration, the My Book Duo makes two copies of each file: one on each physical drive assembly. Simply put, RAID 0 gives you one 8TB logical drive, JBOD gives you two individual 4TB drives, and RAID 1 gives you one 4TB drive that protects your data in case one physical drive assembly fails. You can use the included WD utility to reconfigure the drive for RAID 1 mirroring (4 terabytes), or setup as JBOD (just a bunch of disks). The My Book Duo comes formatted for NTFS, with two 4TB drives striped in a RAID 0 array (8 terabytes total space). This is one of the most spacious backup drives on the market. Music, photo, and video collectors, as well as other digital pack rats, should put this on their short list. Most external drives max out at 4TB or 6TB, but the My Book Duo ( at Amazon) (Opens in a new window) gives you a roomy 8TB of local storage. If you're on the hunt for a basic desktop-class external hard drive with lots of space, then the Western Digital My Book Duo ($449.99) is worth a long look. Involved process to replace hard drives.How to Set Up Two-Factor Authentication.How to Record the Screen on Your Windows PC or Mac.How to Convert YouTube Videos to MP3 Files.How to Save Money on Your Cell Phone Bill.
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