External ssd solid state drive series digittrade high security ssd capacity 500 gb form factor 25 inch design external memory type mlc bus sata iii sata 600 bus speed 6 interfaces usb 20 firewire 800 read speed 540 mbs write speed 330 mbs mtbf 1 500 000 hours controller samsung 3 core mdx encryption aes 128 bit manufacturers warranty 3 years