My iMac is disconnecting all my media hard drives and giving "Disk Not Ejected Properly" message since updating to OSX 10.9

Ever since I updated to OSX version 10.9 on my iMac, it is disconnecting all of my media hard drives and giving me the message: "Disk Not Ejected Properly." My hard drives are connected to my iMac through a Nitro Professional 8-port Firewire 800 hub/repeater, and a Firewire 800 cable from the Nitro hub connects to the back of my iMac. This configuration has been working fine for over a year. Suddenly, and immediately after performing the update about a week ago, the drives won't stay connected for more than a few seconds before the iMac disconnects from my drives. I've tried restarting and reconnecting many times and the same thing keeps happening.
I have a new MacBook Pro (one month old) that I've been using temporarily to work with my photos and video on these drives as the drives are able to stay connected to this computer—I put a Thunderbolt adapter onto the Firewire 800 cable to connect to it. Luckily I had not yet updated it to the new operating system and I am afraid to do that. I've had the persistent message that Updates are available for my computer on my MacBook but I will not perform any updates for fear that I will lose access to my media drives. I am a professional photographer, so it's pretty disasterous if I can't access my drives. Please advise me what to do to keep my hard discs connected to my iMac and what to do to keep this from happening with my MacBook.
Thanks in advance for your knowledge and assistance!

Hello Roma2001,
Thank you for the details of the issue you are experiencing with your FireWire hub.
I recommend following the steps in the section titled "Top troubleshooting tips" in the following article:
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151
Thank you for using Apple Support Communities.
Best,
Sheila M.

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