Format 2 drives as one big drive

Discussion in 'macOS' started by charlien, Dec 21, 2009.

  1. charlien macrumors 6502

    Jul 3, 2006
    Is it possible with OSX to format 2 - 1TB drives to look like one big 2 TB drive? If so, if one drive fails do you lose everything or just the data on that drive?
  2. TheHumphries macrumors member

    Dec 9, 2009
    You could do it via Raid 0. Basically it would look like one 2TB drive even though you are using two 1TB drives. There are some Pro/Cons to this.

    Here is a little breakdown on Raid 0 and its performance:

    The BIG pro is the increased read speed as it can pull data from 2 sources instead of one. The BIG con is if one drive fails, then you lose all data.

    But to me, if you only have 1 drive anyways, not much difference since if you lose it, it is gone anyways. But it does increase your risk of data loss since it is two hard drives over one.

    Apple's HOW-TO for Raid:

    Best Of Luck!
  3. maflynn Moderator


    Staff Member

    May 3, 2009
    Yes, its called Raid 0 or stripping.

    Yes, its a very risky setup because the data is striped across two drives, if you lose one drive, you lose everything.
  4. charlien thread starter macrumors 6502

    Jul 3, 2006
    I thought Raid 0 was simply to increase the write speed and did not increase the size of the partition. Guess I need to read up on the subject.
  5. vansouza macrumors 68000


    Mar 28, 2006
    West Plains, MO USA Earth
    I just did it and am very very happy with the speed increase... as for safety, keep your backups coming.

Share This Page