How hibernation so fast compared to copy speeds?

OK, this is probably a useless, stupid question, but I'm really curious about it.

I just accidentally put my computer in hibernation instead of the sleep mode, while I went to take my temperature to see if I still have a fever.

My computer is running Windows XP and has 1 GB of RAM. Yet, it took less than a minute for the computer go into hibernation mode. It took more time to copy a 600-some MB of drivers and the installation on a USB 2.0 files on the hard disk drive.

Of course, I only have Firefox open right now with a couple of tabs, but I thought copied hibernation memory of the computer on the drive before turning off. He limited things for only the allocated RAM? Even if the Task Manager still shows that it uses about 500 MB
(1038440 total, available ~ 553000)

I'm just curious to know how work of hibernation so fast compared to copy speeds. Especially since it's faster that is Virtual PC or VMWare Player records the characteristics of the State on a superior computer (fastest SATA, faster processor, more than 2 cores, faster, faster bus RAM) when you save a virtual machine 256 MB.

Check these:

Windows XP performance
http://TechNet.Microsoft.com/en-us/library/bb457057.aspx

Hibernate mode (computer science)
http://en.Wikipedia.org/wiki/Hibernation_%28computing%29

Tags: Windows

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