WD 2TB  My Passport Pro Portable  External Hard Drive  - Thunderbolt - WDBRMP0020DBK-NESN Dual-drive RAID storage Up to 233 MB/s data transfer rates Integrated Thunderbolt cable No AC adapter required Durable aluminum enclosure User-selectable RAID 0/1 or JBOD Massive capacity - 2 TB or 4 TB 3-year limited warranty