<div>
To find out whether it is a hardware issue run the disk manufacturer's diagnostic tool on it. Run the long test.
</div>


<div>
How to run the test on HDD2 as it shows as Missing ?<br />
<br />
And where is the Error light on the Hard disk?
</div>


<div>
I removed the drive 2 and put it on another computer to format and use it. <br />
Then broke the mirror on Drive 1 and retrieved the data. <br />
Then added a mirror again with the existing data and blank drive.<br />
Thanks everyone.<br />
<br />
&nbsp;:-)
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<div class="content wysiwyg-content">
Hi,<br />
<br />
My hard disk on Windows storage server 2012 R2, that I had set for mirroring is showing as missing - &quot;Hard disk failed redundancy&quot;.<br />
See image. <br />
<br />
Any ideas on if this is a hardware failure or something else. <br />
<br />
Help.......<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/02_w08/1082429/DiskCrash.png" target="_blank" class="file-inline" title="Screenshot of Disk Management (77 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>DiskCrash.png</a>
</div>
</div>


DiskCrash.png

Hi,

My hard disk on Windows storage server 2012 R2, that I had set for mirroring is showing as missing - "Hard disk failed redundancy".
See image. 

Any ideas on if this is a hardware failure or something else. 

Help.......

Hard disk failed redundancy

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.

Storage Hardware

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.

Storage

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.