system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't phones have to be ejected like flash drives when plugged into a computer?
gpt
Because they have their own power source. They can finish/abort any write operations on battery power whereas a USB drive relies on the machine’s power source.  

Fun fact: the power contacts in the USB port are longer so they stay connected last when the port is withdrawn. So it’s possible for a device to know when it is being disconnected. However, the time period of this event is possibly too small for meaningful work and/or the loss of serial communications makes it impossible/complex.