Western Digital Blue 250GB SSD Western Digital Blue 250GB SSD utilizes 3D NAND technology for capacities up to 4TB with enhanced reliability. Featuring an active power draw up to 25% lower than previous generations of WD Blue SSDs, you’re able to work longer before recharging your laptop, while sequential read speeds up to 560MB/s and sequential write speeds up to 530MB/s give the speed you want for your most demanding computing applications. Combined with the free. you can confidently upgrade your system to the WD Blue 3D NAND SATA SSD. As used for storage capacity, one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on the operating environment.  Active power draws are up to 25% lower during sequential reads than previous generations of WD Blue SSD at the 500GB capacity point. As used for transfer rate or interface, megabytes per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s) = one billion bits per second...