Hab unwrapped the stick, formatted in NTFS and then started to copy it files. After about 2 hours Windows tells me that the stick can not be written because it is write-protected. Have not tested the drive on another computer, the same everywhere. Since he is no longer writable, it can not be formatted again. Have googled the problem, am not the only one with this problem. According to the Kingston website this model does not have a write protection, thus there is a defect.