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Areca RAID 6 array is 500Gb smaller than it should be

post #1 of 4
Thread Starter 
Grabbed an Areca ARC-1231ML off eBay as a controller for 12 drives. Drives are all Seagate 500Gb drives. When I setup the RAID array I picked Raid 6 (10 Data drives, 2 parity) Created a volume of 5000Gb or 5Tb. After initializing (without error) it shows up as 4.5Tb according to the controllers bios. Windows sees the drive as 4657.48Gb which is neither 4.5Tb formatted or 5Tb formatted. What gives?
    
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post #2 of 4
500 gigabyte drives are only 465 gb's

so 465x10 is 4650 gb's

imagine how pissed i am that my 5 2tb drive raid 0 is only 9 tb's
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post #3 of 4
As stated, 500 GB drives are not 500 GiB, it's a base 10 vs base 2 number debate.

You can divide 1000/1024 for each order of magnitude against the rated size.

Therefore:
1000 / 1024 = 0.9765625 (KB) * 0.9765625 = 0.9536743164 (MB) * 0.9765625 = 0.9313225746 (GB)

So, 500 GB * ~0.9313 comes out to roughly 465.65 GiB, so ~10x that as you can see is right where you should be.

Edit: Fixed an erroneous reference to Gibibytes
Edited by beers - 6/8/13 at 9:30pm
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post #4 of 4
Thread Starter 
My bad... fuzzy math at 1am. Thanks for the explanation guys!
    
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