The 4TB Ace A58 SATA III 2.5" Internal SSD from Silicon provides improved system performance, with reduced boot times and accelerated responsiveness. This SSD has a storage capacity of 4TB, a SATA III 6 Gb/s interface, a 2.5" / 7mm form factor, sequential read speeds of up to 500 MB/s, sequential write speeds of up to 450 MB/s. Since SSDs are built with flash memory and have no moving parts, Acer's Ace A58 is shock and vibration-resistant. Also featured is an MTBF (Mean Time Between Failures) rating of 1.5 million hours, an endurance (TBW) rating of 500TB, and SMART, TRIM, and ECC technologies. Protection is provided by a limited 3-year warranty.