Setting up RAID 1 on SBS2003

I'm running SBS2003 on a Dell GX240 with two IDE drives.  The office has three people.  I've set both disk to dynamic, but the option to mirror disk 0 is grayed out.  From what I've read, this should be availble, based on setting the disks to dynamic.

What am I missing or doing wrong?  

Jason
jtcomstockAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
One of the disks needs to be empty - UNFORMATTED.  It should say "Unallocated" or possibly "RAW" when looking at it in Disk Management.  Then you should be able to mirror - assuming the unallocated disk is at least as large as the disk with Windows.
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jtcomstockAuthor Commented:
Its not empty.  How do I unformat the disk?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Backup/move the contents of that drive to another location, then delete the partition.
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jtcomstockAuthor Commented:
I was able to unallocate the drives, but cannot mirror.  They are slightly different sizes.  The system disk shows as 76.3Gb and the unallocated disk shows as 74.6Gb.  I did not create a system partition when I loaded the machine, so I'm going to see if I can create a another partition on the system disk so that I can get the C: drive to 20Gb.  

Any suggested reading on how to approach this?  
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Lee W, MVPTechnology and Business Process AdvisorCommented:
As you see, you cannot create a mirror when the second drive is a different AND smaller size.

As for shrinking the existing C: partition, assuming it's currently using the entire disk, there is no 100% reliable way of doing this. Windows has no built in way.  There are several programs available that can resize partitions, but I don't use them - I've heard numerous stories of how they screwed up the partition and Windows won't boot.  You can try them, but make sure you have a known good backup and frankly, what I'd do is reinstall.

BootIt Next Generation
http://www.majorgeeks.com/download646.html

Partition Commander
http://www.v-com.com

Partition Magic
http://www.symantec.com/home_homeoffice/products/system_performance/pm80/index.html

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jtcomstockAuthor Commented:
I thought you might answer it that way.  It didn't jump out at me that there was a way, after the fact, to repartition the disk.  I'll go for the reinstall route when I have some time.  

The drives have to be the same exact size?  If so, I could get a 100Gb drive and partition it down to match the system volume.  
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