Lies manufacturer on sequential speeds of the SSD 60 GB. The real numbers are read = 274 MB / s, write = 103 MB / s and not 560 MB / s and 535 MB / s as the manufacturer claims. SSD manufacturers take us for pigeons and gives figures totally bogus or worse exchange NAND by slower versions ... Both say that a good drive is faster than SSD for copies of large files sequential, for the OS that's another story ... I need to work with large ISO and ZIP or RAR files, this SSD is slower than my hard drive for that specific use.