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Forum Discussion
ReadyNAS NV+ v2 with 4 4TB drives in raid5 showing 10TB volume
I got 4 new 4TB harddrives (wd green). Did a factory reset with the new drives installed and used RAIDar to configure them in RAID5. One volume is automatically created with a capacity of 10T...
Correct. But that does not account for the missing 2 tb (give or take)
4 x 4 tb in RAID5 = 12288 gb due to parity
4 x 4 tb in RAID5 = 12288 gb due to parity
10.91TB rounded down is 10TB.
StephenB already explained that like most computers we use a different measurement to disk manufacturers.
It's a bit like whether you measure distance in kilometres or miles. You may get a different number for the distance from A to B, but the distance is still the same.
Whether you use base 10 or base 2 for measuring space on a data volume makes a significant difference to the number you get.Using TB (uses base 10) you would get (4-1)*4 = 12TB = 12288GB.
12*(1000)^4/1024^4=10.91. 12TB=10.91TiB. It's still the same amount of space, just a different way of measuring it. Like most computers we use TiB (uses base 2) but call it TB. This can get a bit confusing as disk manufacturers use TB (base 10), but it's the way it's always been as far as I can remember.
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