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See this for more info : <a href="http://technet.microsoft.com/en-us/library/cc738360(WS.10).aspx" rel="ugc">http://technet.microsoft.com/en-us/library/cc738360(WS.10).aspx</a>
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You probably need to go into your raid mangement software and include this drive into the array. Is this drive a hot spare?
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It's pure guesswork until you tell us whether you have a RAID controller or not and if so which make / model.
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Hi Experts. <br />
<br />
I have Raid 5 with 4 disks. And one hdd is failed I want to change that hdd. I buy same size and model HDD the HDD is Unallocated do I need to format HDD before I put into my Raid device?<br />
<br />
Thanks 
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Hi Experts. 

I have Raid 5 with 4 disks. And one hdd is failed I want to change that hdd. I buy same size and model HDD the HDD is Unallocated do I need to format HDD before I put into my Raid device?

Thanks 

Raid 5 Disk changing

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Storage

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