What is the usable space raid 5 with 2 tb 3 sata hdd

Hello,
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More about what usable space raid sata
  1. A. You cannot setup Raid 5 with only 2 HDD's, you need a minimum of 3 HDDs to do this.

    Usable space with 3x 2gb HDD's would be ~4gb (you loose the total of 1 drive to parity)
  2. with 2TB drives
    2x with mirror =1800GB
    __________
    3x =3600GB
    4x =5400GB
    ~total usable after all waste

    3x is not as efficient as 4 as well,
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