Windows not recognizing one of the disks

Hello all,

One of my colleague just installed o one hard disk on the computer with windows server 2008 OS and Now I have total 4 hard disks on the computer. But Computer management is recognizing only 3 disks. I am not sure why it is not recognizing the extra disk

Do we have to do something on it to make it recognizable or it is some hidden windows server 2008 setting?
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
Ned more information.  Is this a server class system?  Are you using Hardware RAID?  Assuming you were, how was the disk installed - was it added to the array (if the controller supports it)?  Was it made a hot-spare?
woolnoirConnect With a Mentor Commented:
is it detected by the BIOS (either system or raid). We dont know the hardware but do you have a system management app (dell and HP do) can it be viewed in that ? it wont show inside computer manager (if its hardware raid) until you actually add it to a set.
TheCommunicatorAuthor Commented:
@Leew: Yes, it is a server class system and I am not sure if it on RAID or not. How can I see that? One thing I can say is that this new harddrive is a replacement of an old Hard drive which was under RAID array.

But when you insert a new one, as far as I know, we have to build an array manually out of it, right?

@woolnoir: Yes, it has OpenManage from Dell but I did not get chance to take a look on that. Let me check with that and then I will let you know asap.
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do you see it in device manager ?
and in disk management ?  you may have to initialise the disk (right click it>initialise)
TheCommunicatorAuthor Commented:
I don't see it in disk management.
nobusConnect With a Mentor Commented:
and in device manager? if not seen - it can be a bad disk
check all connections - reseat all connectors too
juandelacruz2001Connect With a Mentor Commented:
It could a hardware RAID, and have to "recognized" first by the RAID controller before the drive show up in the disk management. Verify if you have the RAID card software installed, and check if the new drive shows up for configuration. If no RAID software installed, you may have to initialize the drive during the bottup/POST.

Good luck!!!
DracoDanConnect With a Mentor Commented:
If you plugged a new disk into a hardware RAID controller that had a raid array running in degraded mode, in most cases the RAID controller would have tried to use the disk to bring the RAID back to optimal/normal operation.  If possible, reboot the system and enter the RAID controllers configuration menu and look at the disks that are being used and the status of the RAID array.  This varies for different RAID controllers, if you want to give more information about the RAID controller, we should be able to provide additional assistance.
TheCommunicatorAuthor Commented:
Hello guys,

Here was the problem. It was recognizing the new inserted disk. BUT  two of the already existing files were already RAIDED so I was seeing them as one single drive. so Instead of 4 , I was seeing only 3 drives :(.  I am sorry for all the confusion guys.
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