>>>"Question: How many Gigabytes Does Windows7 (64bit) require on Disk (or
>>>SSD)
compared to WindowsXP?"<<<<
XP install size is very variable...say 2GB +.
WINDOWS 7 (all versions); Microsoft say "Recommended 21 GB"
I think it will install in less ..
The confusion lies in the creation during installation, of 2 very big system
files PAGEFILE.SYS & HYBERFILE.SYS .Windows Install will create these
determined by your RAM size They will be typically 4GB + each.
But Hyberfile.sys is only used for the 'Hibernation' stand-by feature.
this can be turned of (I have). & that file deleted.
Pagefile.sys is a large variable Virtual Memory file. It can be set to off
but IMO you should have something.
I have a 1GB fixed Pagefile.sys in my XP & Windows Vista & 7 in
a busy games 4GB machine & have never seen a 'Low Memory' message.
Sooo!!! the basic installed WINDOWS Vista or win 7 folders is around 9 GB
plus the above sys files . VISTA is a bit larger than 7.
To confuse even further both Vista & Win 7 have things called 'Hard Links'
within them that point to folders that don't really exist & other odd
things
to maintain compatibility with earlier versions.
This APPEARS to take up space. That is if I look at the System Disc
properties in 'My Computer' it might say 10 GB used BUT !!! if I open that
in folder view in Explorer, then select the Windows folders
& get properties it will give (say) 14 GB (its really that 10 G
.
In short Win 7 will install & run in 15 GB + .
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