I just had to rebuild a RAID 1 array on my PC after having a Barracuda go potty on me. Mine is a Promise PDC20376 on an old MSI KT4 Ultra – hope you have a better controller), and some advice:
1. The BIOS utility (2.0.0) didn’t give you a progress bar for the rebuild option as I’d expect and as the manual states.
2. It’s not obvious that the array is rebuilding at all…
3. …unless you download and install the Promise Array Management software where you can see the status and progress when booted with the degraded array 
4. When it rebuilds a 750GB array, it takes literally hours (about 12 in total, though I lost count…)…
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