I run Arch with IceWM. I tried to configure automounting several ways and failed. But then I discovered that my Dolphin can mount drives to /media. So is it the feature of Dolphin to mount drives or I just half-configured automounting in Arch? 'Cause if it is a feature than I don't need to bother myself configuring automounting.

Automatically mounting removable devices is now handled by the file manager or desktop environment itself in modern Linux systems. While originally you would have had to use something like autofs, that has been made obsolete with new technologies like HAL and UDEV.

Basically, when a new mountable device is detected by the kernel, a signal is sent out to any listening process that says "A new device has been plugged in, and here is it's info". If you want to make use of this signal, you need to use a file manager (like Dolphin) or desktop environment (KDE, GNOME) that is built with support for it. More simplistic desktop environments or file managers don't have support for it.

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