ThinkPad X4 UltraBase

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UltraBase X4

ThinkPad X4 UltraBase

The X4 UltraBase is a portable dock for the X40 and X41 ThinkPads providing extra ports as well as a bay for an optical drive and a set of stereo speakers. Containing a full featured Ultrabay Slim slot, it provides flexibility in drive choice as well as the option of a secondary battery for extended working time on the road. The X4 UltraBase doesn't provide a second docking port as the original UltraBase did, hence you can't dock the UltraBase to any of the other docking solutions.


Pros & Cons

  • Positives: Expansion capability, portable
  • Negatives: makes the ThinkPad quite thick, no extra docking port, not1 compatible with the X41 Tablet
  • Compatibility: X40, X41

Ultrabay Slim

The Ultrabay Slim slot in this dock is a full featured one and supports hot swapping with all Ultrabay Slim drives. You can also feed it with the Ultrabay Slim battery pack to extend the overall battery life time.

  1. According to a post [[1]] it works, although it is not designed to work. For example, the stylus slides into the left near corner from the side – that location is covered by a vertical tab on the x4 Ultrabase.