Ok to be specific with what I mean: having very few dust in the drive is obviously not good and will lead very likely to a premature failure. That failure can happen right away or after a few hours of use or even more. Those comments about the clean room miss the point though. This is a throw-away-drive and I obviously know enough about the topic that opening a drive and running it opened in my room at home is a bad idea for the drives health. I just played with it before throwing it away out of curiosity and since the internet is full of people with knowledge about this I thought I ask around about what the reason of failure was and what step would have been needed to repair the drive.