In this step, you have to choose the size of the persistent data that could be stored.
This feature is currently not working when using VirtualBox in Windows 7 / Vista.
Before going further, I recommend you to read these questions in the FAQ:
- What is persistence?
- What can I do and not do on a Persistent system?
- Why can't I have more than 4GB for persistent data with LiLi?
- How can I have more than 4GB of persistent data?
If you don't know how much to give to persistent data, give between 300 MB and 500 MB. If you intend to make an heavy usage of your Linux, choose more than 1 GB.
Selecting 0 MB means no persistence, only live mode. Any change made in your Linux will be lost on reboot.
Be warned that you must not do system updates. Explanations here.
If you don't have enough space, select the "Format" option in step 4.