Category:5 Series
The 500 series (500, 510CS, 560, 570 and their various sub series) were the main line of the ultraportable ThinkPads. Starting with the IBM 486BL-25 Blue Lightening to the Intel Mobile Pentium III, these machines had only a hard disk onboard. Any other drives were either external or available in the respective Docking Solutions. The successor of the 500 series is the X series.