On my laptop Asus N71J, this disc installed in replacement of another storage drive (therefore not the system disk) is not recognized by the bios and is therefore inaccessible via windows. Set in an external USB enclosure, it is recognized by Windows. After research and testing, changing the SATA setting bios AHCI to IDE, the disc is recognized and operating normally. But then windows is very slow (start, stop transfer, navigation windows explorer). IDE is the ancestor of AHCI brings major improvements. No firmware update available for the hard disk. No flashing my asus bios to solve this problem. This is a problem hard drive. My Internet searches indicate that other people had the same problem and that it would now be hard drive sold by Seagate (which bought the division of Samsung HDD storage) to external storage solution, but then sell some solution of internal storage. I will return this product to Amazon.