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Raid 5 loss of space issue.

Last response: in Storage
October 20, 2010 7:58:41 PM

Im using Win7 x64. I just created a hardware raid 5. My controller is an Intel one.
It consists of 4 x 1TB drives. (931gb actual space)

It says I have 2862GB of space right after I create the Raid 5.
In disk management it shows a new drive with 2794.52gb unallocated and it must be initialised. Once I initialize the drive I get 2 choices, MBR disk or GPT disk. If I do MBR it splits the drive up in two, a 2048gb drive and an unusable 746gb drive. If I put it as GPT it leaves all the space in tact.

Why does MBR do this and where does that space go?? and if I choose to leave it as GPT to maintain that space, is that ok??
im confused with this.


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a b G Storage
October 21, 2010 6:33:25 PM

^+1 Exactly right
October 22, 2010 8:30:43 PM

ahh k. that makes perfect sense then. Because of the limitation of MBR, no wonder it wouldnt get any larger.

The only thing is I wonder why when it created that second partition of 746gb, why didnt it let me format it or do anything with it?

Thanx for the help!
October 27, 2010 2:43:57 AM

Ahh ok that makes perfect sense then. So pretty much MBR is no longer the standard. I guess its gone the way of Fat32.