The n Series is a Dell product line that does not ship with a pre-installed version of Microsoft Windows. Apparently prohibited from shipping computers without an operating system by an existing licensing agreement with Microsoft, Dell instead ships these systems with either the open-source FreeDOS operating system or the Ubuntu Linux distribution.The company has come under fire for making the FreeDOS-powered machines no cheaper and more difficult to purchase than identical systems running Windows
Dell also offers various Precision Workstations with Red Hat Enterprise Linux pre-installed.Only ram is upgradeable . to upgrade HDD or graphics card the whole body of the laptop should be opened
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