Using Disk Utility Restore function to clone external hard drives

Hi all,
I have a WD 3Tb My Book external hard drive which I want to use as a replacement for an older WD 1Tb My Book external hard drive. I would like to use Disk Utility's built-in Restore function to clone my old external hard drive onto my new external hard drive. Unfortunately, Disk Utility will not allow me to drag the new drive to the "Destination" box; I can drag the old drive to the "Source" box just fine. Why is this? Am I doing something wrong?
It might be important to note that my old external drive is formated to FAT32, whereas the new drive came pre-formatted to NTFS. Do I need to reformat the new drive to FAT32 before dragging the disk to the "Destination" box? In other words, do the source and destination drives need to be the same format in order to use Disk Utility's Restore function?
Thanks very much in advance.

Are these drives being used on Windows machines? If so then you will need to create a new partition from the Partition Scheme dropdown menu after which you can set the scheme to MBR. If the drives are being used only on the Mac then you have to prep the new drive as follows:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (for Intel Macs) or APM (for PPC Macs) then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
After you copy your files from the old drive to the new one you want to repartition and reformat the old drive in the same way as outlined immediately above.

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Hi,
Not sure if this is the most appropriate fourm list to post this but I thought I'd give it a try.
I am running snow leopard on my MBP and am trying to use disk utility to erase and format an ext. HD. While the disk icon does not show up on the desktop when I connect it to my mac, Disk utility does show the ext. hd in the left column, but no matter what format I try, even just using one partition and selecting zero out all data, I get the following error: "disk erase failed with the error: POSIX reports: The operation couldn't be completed. Cannot allocate memory".
Is the hd dead? Are there other options? I do have disk warrior, version 4.1.1 and it does not regonize the ext. hd.
Please advise.
Thanks,

Thanks for the reply. Yes, I did select the ext hd as the one I wanted to erase (my internal hd is my start up drive). After I selected the ext hd, (there is no volume listed under it so the only thing I can select is the hd itself). that is when I selected erase and then Mac journaled, then named the hd and then after selecting erase, I got the error. Also as a matter of note, if I select firstaid, both the repair and verify permissions are dimmed, so I can't even try to repair the disk. That is when I tried disk warrior hoping that could examine the hd, but since it is not mounted on the d/t, it doesn't show as a drive to check. I don't understand why the ext hd shows up in disk utility, but not the d/t. Also of note is the fact that when I connect that ext had to my Mac with a fw cable, a window opens saying that the drive is not readable and do I want to initialize it or ignore. I choose to initialize and that is when I get the error. Also of note is that I have tried both security options of "don't erase data" and "zero out data" and still get the same error.
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Internet tab
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Nickles96 wrote:
Hello friends.. I have a similar question, in that I would like to purchase the 2TB TC for use as a NAS device, in addition to taking advantage of the Air Port extreme.. Then I could dump my Linksys router.
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Hello, Esmin77.
Thank you for visiting Apple Support Communities.
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That link seems to be broken. It does normally lead to a solution. For the time being go to
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