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How canI copy the data from one hard-disk to another hard-disk which are connected to the same machine?

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No, it doesn't. – harrymc Jul 17 '10 at 9:46
Yes it does. Not very well, perhaps, but I think people who would be able to answer the question if it were phrased better will be able to understand it. – Neal Jul 17 '10 at 11:33
I stared at this question for a while before realizing that Polestar meant "hard drive" not "hardware". Subsequent answers make more sense in this knowledge as well. – boot13 Jul 17 '10 at 15:43
can you clarify more details on what you want to accomplish? it looks like you want drive cloning software, but it's very unclear. – Jeff Atwood Jul 19 '10 at 3:50

Well ... open your favorite file manager, select and copy ... then paste into the the new drive...

Or, do you mean, how to migrate your hole old drive to a new one, including the operating system?

That may be tricky, but CloneZilla may help you. Connect only your existing drive, make a clone, write to one or several DVDs. Now connect your new drive only and restore the system.

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I don't understand why one should write a clone to DVDs rather than copy directly from one to the other. – Neal Jul 17 '10 at 11:34
If you need to migrate your hole operating system from one disk to another ... you can't just copy/paste. There are OS related informations on the HDD you can't see in a file manager. Ans as I said in my first sentence, if you just want to copy some files, than copy/paste. – Patkos Csaba Jul 17 '10 at 11:54

You could download a hard drive copying tool.

Drive manufacturers such as Seagate offer instructions and downloads for this sort of thing.

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If you need an exact copy and don't want an easy way to do this within Windows look into DriveImage XML If will allow you to use VSS to make a live copy of the whole disk with ease.

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Acronis True Image Home works very well for me in very easy point and click GUI drive cloning under Windows OS -- and the eval version is free and works 100% for the common "I just bought a new larger drive and I want to clone the smaller drive to it" scenario.

But you didn't specify a host OS in your question..

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