IOGear GUIP204 v2 - Manual (Page 31)

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Auto Disconnect
This feature automatically disconnects a printer
or an external hard drive when a user is done
with the device or the device has been idle for
60 seconds. The device will then be available
to other users.
NOTE: This function may not work with some
mass storage devices such as flash drives.
These devices tend to periodically (on a milli-
second base) communicate with the computer
even when the user is not accessing the drive.
Since it never actually stays “Idle” therefore
will never be disconnected by this function.
External USB hard drives do not exhibit this
characteristic.
Advanced Features - Auto Disconnect