A wide belt sander has many different uses when it comes to needing to sand something. A belt sander can be used to sand down piece of wood that you need to get a nice curve on.

it is in a technical workshop

A Dewalt belt sander can be found at a variety of retailers on the web. One looking for a Dewalt belt sander could explore looking on Amazon, Home Depot, or the Dewalt main website.

a disk sander is used for smoothing a large area instead of using sandpaper. :)

A traditional Makita Belt Sander is usually blue with a red cover. The rest of the sander is silver metal and black plastic pieces. They generally cost over $200 for one.