If I pull out my storage card, my device complains that the card was removed unexpectedly, and that I must "unmount" it first.
After googling, I found out that this is some Unix term for breaking the connection between the system and the storage so there is no data in memory that was not yet written to the storage.
However, I have not found an easy way to do this. There is a command, but it is buried in Settings!
Since users are expected to notify the device before pulling out a card, there must be a quick, easy way to do so.
Should I power down the phone? That takes more time to execute, but less effort (fewer strokes).
Come to think of it, with all the devices I have used in the past (cameras, music players), I would power down the device before changing SD cards, but those devices all have nearly instantaneous shutdown and startup times.