I have a Drobo 5N NAS with 3 x 1 TB HDD's (2 x SATA 5400 RPM + 1 x SATA 7200 RPM), and I just replaced its fan but was stupid enough not to test it before reassembling. When I turned on the NAS, the fan didn't start, and it reported one of the HDD's missing. It turned out I didn't properly insert the HDD, then when I did, it started rebuilding. It's already running for almost an hour now, and it says there are still 3 hours remaining.
I wish I could just shut it down and try to fix the defunct fan, but if I do that in the middle of rebuilding, I risk losing data, however, an overheating HDD may fail too, so that could lead to losing data as well.
I was wondering, are these 3 HDD's, stacked one above the other, with a few mm's and a layer of metal between them, supposed to withstand the heat they're producing in about 4 hours or is there a potential they'd break before the rebuilding finished?