More Efficient: Sequential read speeds up to 560 MB/s and sequential write speeds up to 530 MB/s. More Reliable: A solid state design is a more durable and reliable alternative to a traditional hard drive. No moving parts, less risk. The MTBF (Mean Time Between Failures) of JS-500 SSD is 2 Million Hours. Enjoy the long and trustworthy quality of LEVEN JS-500 SSD. More Choices: LEVEN provides all kinds of capacities to meet your needs: 128GB, 256GB, 512GB, 1TB, or 2TB. Take your pick. Note: The actual available capacity of our solid state disk is a little smaller than we listed due to the different calculations between computers and manufacturers. Computer: 1 MB = 1,024 KB. 1 GB = 1,024 MB / Manufacturer: 1 MB = 1,000 KB. 1 GB = 1,000 KB.