Indeed a good question. The manual isnt clear or in my opinion showing a wrong direction when speaking about "When a replacement hot swappable drive is installed and the system is powered on, the drive automatically begins torebuild" within the mid-bay. BECAUSE.... in all the years there was a rule of thumb which says.. if something have a orange(red) handle its designed for hot swapping and can be replaced when the server is up and running(see disktrays for front/rear, fans, psu or the new boss-2) and when its "blue" like release handles for pcie cards/riser and so on than the server needs to shutdown. The release handle for the midbay are marked "blue". Regards,Joerg
Hello During configuration in OSC, I chose the following chassis for R740xd: Chass is : 12x3.5" HDDs on BP, 4x3.5" HDDs on MP and 2x3.5" HDDs Flexbay My question is;  Are the disks in Midplane and FlexBay hotplug?    In OSC, I dont see "hotplug" in their definitions when I choose a disk for MP or Flexbay  but I suspect that we can safely remove those disks while the server is operating so I couldn't be sure.  There is no information in technical guide or other formal documents regarding this.  Thanks in advance.       
Regarding hot-plug disks in R740xd