I try and avoid anything over 49C with my mechanical drives. My Seagates and WDs in the Mythbox and backup array rarely get over about 45C. Normally they are between 34C and 40C.
IIRC, the big SAN arrays I supported considered anything above 45C as a warning and 50C as critical worthy of shutting down the enclosure. Was an interesting challenge to see with the 15K and many platter drives of the time prior to the rise of SSDs for the performance tier.
The backups for this board wind up on an ARM powered ReadyNAS, 2 bay. It's got the fan running at ~800rpm currently and it's keeping the Seagate drives at this temperature:
ST2000DL003-9VT166 1863 GB (34 °C / 93 °F, Write-cache On). Status: OK
My larger NAS has 4 Samsung drives, and a larger fan running around ~1800rpm.
SAMSUNG HD203WI 1863 GB , 29 C / 84 F, at the low end, and 32 C / 89 F for one of the ones in the middle.
Not sure what will replace them, as I tend to go one tier below the largest drives. Looks like by next year that might be in the 8-10TB range.
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