I have a Drobo containing, from top to bottom,: 500GB, 500GB, 500GB, 1TB.
The three 500GB drives came from dismantled Western Digital My Book enclosures.
The 1TB drive came from dismantling some kind of Maxtor external enclosure.
So my question is this: which of the three 500GB drives do I replace. Is there any way of telling which is the oldest/noisiest/most likely to fail? My main concern at the moment is increasing capacity and reducing the noise, as my Drobo has been blowing like a hair-dryer in the recent warm weather.
Finally, could someone try to estimate how long the rebuild process will take when replacing one of the 500GB drives with a 2TB drive? My Drobo currently has 726.78GB of Used Space and 639.88GB of Free Space.
Thanks in advance,