Colin: I agree. A smart card is generally used to identify a user. So it is a good idea to use it to mount a home directory. But mounting /usr or / would using a smart card is a very strange configuration and very uncommon.
Colin: I agree. A smart card is generally used to identify a user. So it is a good idea to use it to mount a home directory. But mounting /usr or / would using a smart card is a very strange configuration and very uncommon.