After security patch 03/04/2014 OSX 10.7.5, first one, then a second, external backup drive no longer recognized.  Diagnostics for the FireWire one displays brand name of unit, but Time Machine and its own app don't see it.  Where do I start?

Yesterday I installed the security patch, OSX 10.7.5 to my IMac that is about 2 years old.
Today my Seagate BackupPlus for Mac will power on but is not recognized.  It does not show up as a device, Time Machine says the latest backup was DELAYED, last successful at 03/04/2014 9:35 PM (yesterday) and next backup would begin when the disk was connected.  An error message I did not save said basically the drive was not recognized.   I did all drive's  troubleshooting steps, including installing a newer version of their app.  I tried swapping USB for FireWire, changing electrical outlets, etc.  
It seems a bit coincidental to have 2 drives "fail" simultaneously.  Is anyone else having this issue after this security patch?  What would be the approach from the Mac side?  TIA for any assistance.
Please see below regarding the second drive.  Is this a red herring, or does it help pinpoint where the failure might lie?
I also have a Seagate GoFlex that WAS recognized until I did the troubleshooting on the other drive.  When I put it back on after testing the other drive with FireWire, it now is no longer recognized. 
Diagnostics says this about that:
FireWire Bus:
  Maximum Speed:          Up to 800 Mb/sec
GoFlex Mac:
  Manufacturer:          Seagate
  Model:          0x6090
  GUID:          0x2037600121908F
  Maximum Speed:          Up to 800 Mb/sec
  Connection Speed:          Up to 800 Mb/sec
  Sub-units:
GoFlex Mac Unit:
  Unit Software Version:          0x10483
  Unit Spec ID:          0x609E
  Firmware Revision:          0x111
  Sub-units:
GoFlex Mac SBP-LUN:
Thirdly, in after one of the testing/reboot loops, the HP WiFi printer was no longer recognized, but after a few more it came back.  

I have a similar problem.
Moreover, as my external drive is split in 2 for (a) regular storage // (b) time machine usage, I can see in the Finder that I can connect to the (a) regular storage part and use it normally (image 1).
And I cannot connect to the backup part in Finder , nor see it in Disk Utility, nor use it in Time Machine (although it's listed in the Time Machine preferences, image 2), as it does not connect (image 3).
Can somebody help?

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