There are two ways to calculate Gigabyte (GByte): Using base 2 or using base 10. The operating systems use the base 2 “1024” definition of GByte, while disk drive manufacturers use the base 10 “1000” definition. Base 10 would define GByte as 1000 x 1000 x 1000. Base 2 would define GByte as 1024 x 1024 x 1024. Regardless of which scheme is used, you have exactly the same about of usable capacity. Areca RAID controller volumes are simulated a big disk drive and use the base 10 “1000” definition same disk drive manufacturers. Raw unformatted capacity of a hard disk drive is usually quoted with “SI prefix” (metric system prefix), incrementing by powers of 1000. The operating systems report the formatted capacity of a hard drive using “binary prefix” units which increment by powers of 1024.
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