The desktop replacement notebook, short DTR, emerged in the early 2000s with the arrival of more powerful hardware that was compact and power-efficient enough to be built into a notebook form factor. While these designs are generally described as notebooks, they are more appropriately referred to as "portables" due to their size and weight, which can approach 15 pounds in fully equipped models. Battery running times are usually less than 1 hour. By 2006, several manufactures had carved out a niche for themselves to cater to the needs of a mobile workstation market with devices that integrated server processors, workstation graphics cards, up to four hard drives an 17-inch screens. While these computers primarily addressed market verticals and have not captured any mainstream interest, they are the successors of the traditional workstation and offer workstation-class hardware that is typically not offered for traditional notebooks. High-end DTRs, such as the picture Eurocom Panther 4.0 model, can cost more than $20,000 still today.