Hello, so I am planning on buying a Drobo 5N soon for time machine backups for my Macs. Since it comes without any drives, I have been trying to scavenge for 3.5" HDDs and want to take the HDD out of the Western Digital My Book for Mac (WD My Book Hard Drive for Mac 3 TB (WDBYCC0030HBK-NESN)). I have been looking everywhere but have not been able to find out if this enclosure has a 3.5" or 2.5" HDD in it. If anyone knows or can refer me to a place where I can find out, that would be great. Also, if there is a 3.5" HDD inside, will I be able to use it with the Drobo? I am not a fan of the WD My Book enclosure but I would still like to get SOME use out of the drive. Thank you.