Various hard drives are dropping out randomly on my Mac Pro 2013. I have an OWC Thunderbolt 2 dock which sometimes drops out without warning and I get a "Hard Disk disconnected incorrectly" warning. I have more frequents faults of the same kind on USB external hard drives, mostly Bus powered portable drives. Does anyone know why this might be happening?
Mac Pro
I have a 2015 Mac Pro also with tons of externals without any type of problem as you describe.
After reading your post this is what I do differently; I don't connect any hard drive directly to the OWC TB2 dock except for temporary functions whether it be USB or thunderbolt. I will connect a usb optical drive permanently and that's about it. I just use it as a temporary hub.
I don't move my computer by twisting or turning very often because the thunderbolt connections can easily work loose.
I separate my connections utilizing the three thunderbolt buses and the 6 ports. How you connect makes a difference even in booting externals. I use two displays, an Apple thunderbolt and a Dell 4k these are on separate TB ports and buses. I have 5 thunderbolt externals connected but TB2 devices are separated from TB1 devices using different TB buses. So experiment around and try to pay attention how things are interacting.
Thanks for your reply and suggestions. I use the OWC Dual Bay Drive dock for video data drives by project. They need to run the large amounts of data for editing and the dock remains connected at all times. The dock is the only TB2 Hard drive device connected to a single bus so the busses are not overloaded. Computer never moves, cables are checked and safe. Still looking for a smoking gun ;-)
I have a 2015 Mac Pro
There is no such animal. The last silver tower MP was in 2012 and black trash can in 2013. Last year there was the iMac pro.
Trash Can, 2013 model, purchased new in 2015.
Hard drive drop outs