Can I upgrade 1 drive from 2 to 4TB, and leave the rest at 2TB?

I'm wondering if when I run out of space, if I can increase the capacity of the the unit by upgrading the size of the drive, one at a time, or do they all have to be upgraded together (like RAM). Does anyone know?

LaCie 20TB 5big Thunderbolt Series Hard Drive

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    If you are using in JBOD mode, yes, a simple substitution.

    However, not so easy if the configuration is RAID-0 or RAID-1. In either of these instances, you will have to reformat the entire array if the replaced drive is part of the array. Reformatting, of course will erase anything already on the drives, and you will now have a new, empty, but reformatted array.

    So, for maximum effectiveness, consider the following:

    if all existing drives are part of one RAID-0 array, then all drives should be replaced at same time and then reformatted.

    If configured as RAID-0, there are many possibilities:
    - 2 drives mirrored, plus 2 drives mirrored, plus 1 independent --> the last drive can be replaced independently
    - 2 drives striped, plus two drives striped, then mirrored to each other, plus 1 independent --> the last drive can be replaced independently

    In the above two examples, the striped or mirrored drives would need to be replaced in pairs.

    It's also possible to have 3 drives striped into RAID-0 with the other 2 drives mirrored into a RAID-1 array, or kept as two independent drives.

    IN other words, many possibilities.

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