What is "secure" depends on the scenario you have in mind. I keep some work-related on my flash drive encrypted, in case I loose the flash drive on the train or

What is "secure" depends on the scenario you have in mind. I keep some work-related on my flash drive encrypted, in case I loose the flash drive on the train or something like that. There was a case a couple of years back where somebody in the UK, I think, lost a flash drive with very sensitive data, like, medical records of prison inmates or something like that, on a train, unencrypted - the data I carry is far less sensitive, but this is precisely the scenario I want to be protected from.