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Question

Problem mirroring an external drive

would like to mirror disk 10 into disk 11 but if I right click Disk 10 in the Disk Management tool, 'add mirror' is grayed out.
The disks are physically identical.
Before I started, disk 11 had two partitions one about 2 TB and the other about 1.6 TB. So far I was able to get Disk 11 to have 1 partition as shown in the screen clip below. Note that the size of Disk 11 is shown as 0.01 GB less than that of disk 10.
So how do I go about getting 'add mirror' not to be grayed out.
Disk 10 has data on it which I have backed up on another drive.
Disk 11 has no useful data.
Thank you.
I have downloaded EaseUS Partition Master (free version) so have that available as a tool.
Thank you.
http://i1376.photobucket.com/albums/ah9/greenbaumsteven/Mirror_zpsthvjlvse.png

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All Answers

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Answer
I am not sure of the term "mirroring" but...

In reply to: Problem mirroring an external drive

I guess that's the same as "cloning". My understanding of cloning is that one OS to one harddrive only. You can put more than one "images" in a Hdd. but that's not exactly the same as cloning. I am not all that clear as how it is use so I use the cloning method because Hdd. are not that expensive.

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Re: mirroring

In reply to: I am not sure of the term "mirroring" but...

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Answer
Next Step (by OP)

In reply to: Problem mirroring an external drive

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Answer
The few times I've seen mirroring AKA RAID 1

In reply to: Problem mirroring an external drive

The results did not save the owner from a trip to our shop. In most cases the trojan or such damages the data and the mirror faithfully damages the mirror copy.

As to hardware failures, the unlucky souls had read errors and the corrupt data was mirrored on the second drive.

You can imagine I'm not a fan of RAID 1.

If you were to clone the drive on your schedule you would avoid most of those failures I've seen over the years.

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