Boot2docker : image don't save

I’m starting to play with docker on my PC (windows 7) so I’m using Boot2Docker, but when I stop the VM all my work are remove. My questions are:

  1. Why ?
  2. How to solve this problems ?

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  • One Solution collect form web for “Boot2docker : image don't save”

    finally I resolve my problem:

    1. Solution I’ve made a boot2docker delete and then a boot2docker init, when I start/stop the VM it works correctly (and it starts faster
    2. Why : I don’t know, the only possible reason is that I install boot2docker ant activate the VT-x in the BIOS after
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