Note that this tutorial assumes that once'already with one operating system to another disk, and older and to have access to the new system.
Step one: back up your entire hard drive
Given the abundance and cheapness of storage in the time available, it's quite possible to just create an image of your old hard drive and save it somewhere else, restore individual files and folders if necessary. Just Don't do something for the storage density of the image file on your hard drive is out of the picture.
Windows
If you're after a free solution, Runtime's DriveImage XML will fit the bill. Those who find more comfort in commercial solutions can't go past the excellent Acronis True Image Home 2010.
OS X is a disk imaging tool installed in your Applications folder, just go \ Utilities and launch Disk Utility, select your hard drive or partition you want to create an image and choose the new image.
You can then move the contents of the images simply by double clicking the file, or you can retrieve by following the reset button in Disk Utility, and instructions.
Linux
(Editor's Note: According to the set-ups that need these commands using sudo) dd is the tool of choice. For example, if dd =\ \ dev sda of = hdd.img is an image file named hdd.img from the hard drive is on sda \ \ Create a dev. Of course, you'll \ have \ to replace dev sda with the disk or partition of your choice.
In this command, if the file or the input device and the output is the file or device. If you've more than one partition on a hard drive can be difficult, so if you keep things simple, maybe you take a picture of individual partitions, not the whole hard drive.
To restore another disk, you simply use dd again, but the use of hdd.img file as an argument, when, and the target disk.
If you do not restore'd rather the whole picture Just look at what ' s, you can browse the files in a folder to mount:
mount-ro cycle hdd.img mnt .\ \ \ test
You should see the contents of hdd.img mnt \ Assuming \ test (you've created a list in advance) - of course, you ' ll have your own values for the image file and folder replacement will be mounted anywhere desires. -R argument to mount the image read-only an exaggeration, but we want to be sure.
To remove the directory umount only to see the image is mounted inside
umount mnt \ \ test
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