External discs not showing after Security Update

Did recent security update and all of a sudden one of my external drives which has worked fine on a Belkin hub for months is not showing up in Finder.
Fearing the drive may have failed I connected it to a Macbook running Leopard and it was nstantly seen.
iDisk was also not showing up for mtime to time.
Anyone else having Finder issues since updating?
AC

OK verified the system (OK) and external drive.
External drive had wrong free block count which has repaired.
The thing still isn't recognised on either Belkin powered hub but is recognised if I unplug the hub and connect it direct. Other identical external drives (I have several of the same make/model/capacity) work fine via the hub.
The problem drive spins up, the hub does not illuminate an LED for that USB socket (unlike the ones that work), then the drive spins down.
Connecting direct to the Mac and the drive spins up, spins down, then spins u again, and this pattern is completely reproducible.
If this were a pending hardware failure I'd expect startups to be random on the hub or the main USB port but they're not.
Very odd.
AC

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I can't seem to find any other posts about this problem.
I have three external hard rives connect by a USB hub to my iMac.
Problem is that if I turn on the hard drive(s) AFTER start up I get a message that the drive either was not recognized by the OS or that it was ejected unexpectedly.
I get the same issue but not all the time if I turn them on before I boot the iMac.
I used the disk drive utility to "repair" the drives but they always come back as "probably ok".
If I restart the iMac with the drives connected (on), it seems to work but not all the time.
A bit annoying as I am wondering if the drives are OK or not.
I don't always need the drives as they are for backing up images from my camera using Apreture.
This all began after i did the latest security update.
is the update to blame?
mahalo.

Yes, you can still use those instructions to reset the PRAM.
You said that you booted to your install disk and that your primary drive did not show up at the Select a Destination screen? That usually means that the computer is either not recognizing your partition, or it's not recognizing the hard drive itself.
Start with this article and follow all the steps even if you already tried them. I suspect that you'll get to step 4 and you'll end up having to call Applecare. If you haven't done those steps, they're most likely going to make you do them anyway, so you might as well get them done before the call.

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This is what worked for me:
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Tried fysk, which worked for a while, but eventually the computer wouldn't reboot again.
Connected it to another mac via firewire in target mode and erased all the data (yes I had a time machine back-up), but still wouldn't reboot from disk.
Solution: A friend of mine tried resetting the PRAM again (command, Option P,R) but this time, he continued pressing the start button until the third chime (rather than the second as per apple instruction).
All of a sudden we were able to reboot from disk, reintall the OS X 10.4.9 and then do a regular update to 10.5.6. My MBP has been working fine ever since.
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Contact the game author's site and report it so they can update it.

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I'm running late 2009 iMac 27" with up-to-date Mavericks (10.9.5).
I just ran the Security Update 2015-002 and now:
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Both drives show up perfectly on another Mac (with Yosemite). Just not on this one.
Tried the usual, repaired permissions, reset pram, etc.
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Try resetting the SMC:
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Run each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
Reset the SMC
as per > Resetting the System Management Controller
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait five seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
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Hello -
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Darth

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First run the hardware test from the original installer discs:
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If your data is not backed up, see this user tip:
http://discussions.apple.com/thread.jspa?threadID=1308817&tstart=0
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Hi Arkku , and a warm welcome to the forums!
I'd certainly give Sig's advice a try first.
If that should fail...
applesetupdone...
This was Posted by: JoseAranda at September 9, 2006 3:48 AM
"OK, restart your computer, hold down Command-s and type in the following:
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end of posted by: JoseAranda"
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http://theappleblog.com/2008/06/22/reset-os-x-password-without-an-os-x-cd/

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External discs not showing after Security Update

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