Thunderbolt 2 and USB 3.0: 3TB: Up to 180MB/s readsThese transfer rates were achieved using AJA System Test when connected to a Mac computer via the Thunderbolt 2 interface. Actual data rates may vary depending on operating environment and other factors, such as chosen interface and disk capacity. 4TB: Up to 180MB/s reads 6TB: Up to 220MB/s reads 8TB: Up to 240MB/s reads
With LaCie d2 SSD Upgrade: 1150MB/s readsThese transfer rates can be achieved by installing the LaCie d2 SSD Upgrade on a LaCie d2 Thunderbolt 2. The LaCie d2 SSD Upgrade is not compatible with the LaCie d2 USB 3.0.
Thunderbolt 2 Technology
Bidirectional 20Gb/s permits a high-resolution display and RAW 4K video playback
Reduce power consumption by spinning down disks without disrupting daisy chain transfers (short press on front button initiates power-saving mode; long press turns product off completely)
Internal Storage Media
1 x 7200RPM/64MB cache (or greater) hard disk
Enterprise Class: 1 x 7200RPM/256MB cache hard disk with 2 million hours MTBF and 24x7 power-on operation