Dell poweredge R720 HDD not detecting - RAID PERC H710 Mini Problem

I have 4 Qty 1 TB SATA HDD in my Dell poweredge R720  . But only 2 HDD appear in the PERC H710 Mini RAID config utility in the BIOS.
jobby1Asked:
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PowerEdgeTechIT ConsultantCommented:
Did you install the "new" 2 disks, or are they all originally-installed disks from Dell?
Are all of them the same make/model?  If not, what is the make/model of the "new" ones?
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jobby1Author Commented:
It is installed originally by dell all disks are same size and speed.
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PowerEdgeTechIT ConsultantCommented:
Did they ever work or is this a new server?

Only two show up on the PD MGMT screen of CTRL-R?
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jobby1Author Commented:
After I swap the HDDs now all the 4 HDDs showing as ready but not online in PD mgmt and BIOS device setting HDD properties.I cannot config RAID or install windows now.
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jobby1Author Commented:
Also i noticed 2 hdds are segate and 2 hdds westen digital.is this a problem.but same speed and size.
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PowerEdgeTechIT ConsultantCommented:
As long as the drives are certified, then the make/model doesn't matter.  It is unusual (but not impossible, for this reason, that Dell configured it with different makes/models), but if they were not all original Dell drives, the issue would most surely be one of compatibility.

At this point, you "should" be able to configure RAID as you wish.  Make sure the drives are not foreign ... highlight the controller on the CTRL-R, VD MGMT screen, foreign, clear.
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jobby1Author Commented:
Now I managed to confg RAID 5. Howe ever I can not create the partition size more than 2.2 TB while installing windows. The remaining space system  create another volume but I can  not format or do anything. I am using windows 2012 R2 std.
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PowerEdgeTechIT ConsultantCommented:
Windows cannot use a disk larger than 2TB unless it is a GPT disk.
Windows cannot boot to a GPT disk unless installed on a UEFI-enabled system.

You need to boot to F2 and change the boot mode to UEFI, then you need to convert the "disk" to GPT prior to installing Windows.  If you need help doing this, you will need to start a new question.

http://technet.microsoft.com/en-us/library/dn336946.aspx
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PowerEdgeTechIT ConsultantCommented:
Why the grade of 'B'?
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jobby1Author Commented:
does it matter?
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PowerEdgeTechIT ConsultantCommented:
Yes.  

1) It helps me know what to do to improve answers.  
2) EE would like you to explain the reason for a 'B' grade, so others know what kind of information is "missing" from the Accepted Solution(s) to have a "complete" solution to be able to resolve their issue too.
3) Points are awarded based on the grade.

http://support.experts-exchange.com/customer/portal/articles/481419

I don't care about points or a "perfect record" ... others read and rely on these threads for solutions, and while it appears from the thread that the information I provided was what you needed, the grade of 'B' indicates that something was missing from it to be considered a "complete" solution.

I won't bug you about this or anything - I'll let you do whatever you will with it - but most Experts rely on the grading to improve their answers.

Take care.
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