Good question. Good link from Rick. Here's an explanation from Jill Zoller
with input from SR team members at MSFT:

[url]http://blogs.technet.com/filecab/archive/2006/11/16/identifying-how-much-disk-space-is-used-for-restore-points-in-windows-vista.aspx:[/url]

Good luck,

CH


"Vega" <vegalabTOGLIMI******.it> wrote in message
news:%23o7Z$DB6HHA.4712@TK2MSFTNGP04.phx.gbl...[color=blue]
> Scrolling the Registry I found the following key:
>
> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
> NT\CurrentVersion\SystemRestore\cfg
>
> In the right pane there is a dword value "DiskPercent = f (hexadecimal)"
> which sets the amount of System Restore to 15%.
>
> Question: is it possible to adjust the System Restore size permanently by
> changing this value?
>
> Thanks,
> Jurij Vega
>[/color]