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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.
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ASKER

It is installed originally by dell all disks are same size and speed.
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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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ASKER

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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ASKER

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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Why the grade of 'B'?
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ASKER

does it matter?
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.