WD 2TB My Passport For Mac...
WD 4TB My Book Duo USB 3.0 HDD External 3.5" Desktop AC Powered
The My Book Duo 4TB (2 x 2TB) Two-Bay USB 3.0 RAID Array from WD comes with two WD Red hard drives that are pre-configured in RAID 0 to deliver data transfer rates of up to 290 MB/s. Its two drives support 4TB of storage in a 2 x 2TB configuration and are formatted as NTFS for Windows 8 or higher, as well as Windows 7 and Vista. The drives can also be reformatted for use with Mac OS X, configured in RAID 1 for data redundancy, or in JBOD to use each drive individually.