The reading and writing speed of Dele 256 SSD is 559 MB/ s. The reading and writing speed of Dele 256 SSD is 559 MB/ s, the interface type is SATAIII, the main control chip is SMI2245K, the HDD size is 2.5 inches, the external size is 100.2×69.8×7mm, and the maximum continuous writing speed is 358 MB/ s..