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How can a small snapshot save all information of a large VM disk?

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Hello,

 

I'm using VMWare Workstation 8. I'd like to use snapshots to be able to revert to a "clean" state in case of a virus infection.

My 2 virtual disk have a size of  more then 250 GB, with at least 60% used fro data.

When I took a snapshot, the size of the vmdk file of that snapshot wa just 3 GB. How can this small file include all information of the large disk ? (60% of 250 GB used).

 

Does the state of a VM really include all the disk data at the moment the snapshot was created ?

 

It would be nice if someone would answer my question.

Wilfried


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