hot plugging - hot swapping
This is useful when a system component fails as it enables a new device to be installed without system downtime. Two external bus standards -- Universal Serial Bus (USB ) and IEEE 1394 -- support hot plugging. This is also a feature of PCMCIA.
Hot Plug Versus Hot Swap
While the terms hot plugging and swapping are used interchangeably, hot-pluggable devices typically require administrative tasks to complete the switch (i.e. mounting the hard drive after the new drive has been installed). Hot-swappable devices do not require any additional tasks to install, such as swapping a power supply in the system.
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