Having 2 SD media and 5 1TB external HDD between 256GB and 1TB, I have something to compare (LaCie - Iomega - WD - Seagate). Even criticism for Seagate 256MB: write access slow and despite the USB3. 10 times slower than my WD 500GB USB3 in, while many newer. Satisfied for capacity, disappointed for the slowness!