One came with a USB connector. All four discs are significantly slower! Maybe it's not an Apple-to-Apple comparison, but the T7 smokes the drive heavily. A 1.5TB backup takes 8 hours on them, while a T7 completes in less than 90 minutes. I understand the Gigastone 550/MB and T7 are twice the speed but... These drives have proven unreliable and after investing $1000 in four of them it doesn't look like they're worth it . Do not buy!
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