DELL offers cab file and lenovo,HP what type of driver files just looking steps for Lenovo and HP each model example what is link to download the driver files and other settings used in task sequence or package

This should help you out:

• Lenovo: http://support.lenovo.com/en/documents/ht074984
• HP: http://www.deploymentresearch.com/Research/tabid/62/EntryId/55/HP-takes-the-next-step-and-provides-ready-made-driver-packages-for-MDT-and-SCCM.aspx