Can I compress a partition and keep all the erased data?

QUESTION

Is there a way to save a 160GB NTFS partition in a smaller space and
at the same time to retain ALL the data? That retained data would
include clusters of *erased* data and *erased* system files.

I believe that creating a typical image file of the 160Gb partition
would not include those erased data areas. But is there some other
way to do what I want?

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OBJECTIVE

My objective is to be able go back to this partition and to undelete
data as and when I might need to.

The 160GB partition contains XP Home and is on a PC which is only a
few months old. This means something like 100GB to 140GB of the
160GB is completely virgin space. It seems a pity not to reclaim
this 100GB+ space for use - but only if it's still possible to KEEP
the clusters which contain data but which are not "marked" to say
their data is normally available. (If you see what I mean!)
.

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