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During installation, Windows 7 will need about 16GB on a hard drive.
depends on how much space your hard drive or solid state drive can hold.
A 20GB hard drive with at least 15GB free space.
The "total amount of drive space" is whatever the capacity of your hard drive(s) is.
It requires 20 GB of free hard drive space.
If it has the minimum RAM and hard drive space, you can.
it depends on which one you buy
No, you only need a bootable DVD drive and enough hard drive space.
at least 15 gb
There is no limit. The space on your hard drive is the limit
No. There is no method by which you could map hard drive space to the memory address space in Windows XP (you can use RAM as storage, but not vice versa). Even if you could, the performance would be so slow as to be useless.
That will depend very much on how you use your computer. if you only do office work, web surfing, and listen to a little music, a 40 GB hard drive with Windows Vista, or even a 10 GB hard drive with Windows XP is probably fine. For movies, games, and video editing, you'll want lots more.