Hello,
i have an old drobo 4d / DRO4D-D (2nd gen.) with a very noisy fan.
Now i search for a new Fan before i open it.
Did anybody know which size the 4d Fan have, 80mm/92mm/120mm/140mm?
Hope anyone can help me
hi chamsin, a quick search on the forum found me this large thread which might have helpful info for you 
http://www.drobospace.com/forums/showthread.php?tid=1608&highlight=fan+replacement
thanks, i wasn’t sure if it’s the same size in a drobo 4d.
so it’s a 120mm fan, perfect!