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Create partitions in the unallocated space, format to ntfs, &nbsp;and assign them driverletters.
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Create partitions in the unallocated space, format to ntfs,  and assign them driverletters.

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Please clarify your disk configuration as requested. &nbsp;<br />
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How many actual hard drives (not partitions/local drives/drive letters)<br />
How many RAID arrays (is the OS drive a separate array or portion of a single existing array?)<br />
What kind of RAID arrays<br />
What kind of hard drives? &nbsp;SSD, SATA 7.2K RPM, SAS 10K, 15K?
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Please clarify your disk configuration as requested.  

How many actual hard drives (not partitions/local drives/drive letters)
How many RAID arrays (is the OS drive a separate array or portion of a single existing array?)
What kind of RAID arrays
What kind of hard drives?  SSD, SATA 7.2K RPM, SAS 10K, 15K?

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Once we have the clarification we can advise vis-a-vis MBR and GPT and the 2TB barrier which is obviously causing a problem currently.
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Once we have the clarification we can advise vis-a-vis MBR and GPT and the 2TB barrier which is obviously causing a problem currently.

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I have a new server with a C drive of 136 OS install space and 2 unallocated drives of 2048GB and 4094GB that have automatically split in the disk management. What is the proper way to allocate the space? I am trying to build a Hyper-V with an Exchange, apllication, and DC File server VM.
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I have a new server with a C drive of 136 OS install space and 2 unallocated drives of 2048GB and 4094GB that have automatically split in the disk management. What is the proper way to allocate the space? I am trying to build a Hyper-V with an Exchange, apllication, and DC File server VM.

I have 6TB of unallocated space on my server, what is the proper way to allocate?

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.