Firewire external mobil disk hard drive is no longer recognized

After last system update, my firewire external mobil disk hard drive is no longer recognized. Any solutions?
Why does MacOS go backwards... gets worse over time?

Thought you could use this info about getting FireWire to work! I have had no trouble with any update Apple puts out (the Combo update is what I normally choose). Are you running 9.2 like your specs. say? You are in the Tiger forum, so I'll assume you haven't updated your Macs specs.
First, you should always Repair Permissions in Disk Utility before and after any update; I would do that now. If you installed your update with FireWire plugged in, your Mac may not recognize it anymore.
Try resetting your FireWire ports by disconnecting all FW devices, shut down your Mac and unplug it from AC power (wall socket) for 30 minutes. plug it back in and try FW.
If that did'nt work, download the combo update from this site (yours may be corrupt), not Software Update, disconnect all firewire + USB devices except keyboard + mouse, Repair Permissions, re-install update, Repair Permissions again + try. Yours may be the 10.4.5 Combo update. Others reading, download the Combo that applies to your system.
If that still did'nt get it Zap the PRAM. While restarting Mac hold down the following key combo Command-Option-P-R. Keep holding those keys down till you hear the second start-up chime, then release.
For those of you with Macs that are not PowerBooks or iBooks, a bad internal battery can cause FireWire to not be recognized, so make sure it's good!
Good Luck!
Cheers!
DALE

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If you look at your >SystemProfiler (option key)>Hardware>Firewire.
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throwing more power to the drive wont fix that.
SATA bridge card as found inside all USB HD devices which has an extremely high failure rate.
Inside a USB hard drive, containing the HD and SATA card
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http://www.ebuyer.com/product/128482
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dead sata bridge card. very common problem.
see all about it here:
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Hi rivraff,
If you are having issues mounting an external hard drive volume, you may want to see if it shows up and/or can be repaired in Disk Utility; you may find the following article helpful:
Apple Support: Using Disk Utility to verify or repair disks
http://support.apple.com/kb/ht1782
Regards,
- Brenden

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Hi danielsh6,
I recently bought the new Lacie Thunderbolt 2 D2 3TB and I had the same problem as you, i have a macbook pro early 2011, those support thunderbolt but many times there is a bug that doesn't let you connect any thunderbolt drives to your computer. The solution I found was installing this update:
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Forest

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Here's the problem, in my attempt to explain it a little more clearly. There are a number of different ways data can be written to a drive, called "partition schemes"... think of them like languages used when printing a book. Like languages, some systems cannot understand some drive partition schemes. Unlike languages in a book, however, a system may be able to read a partition scheme, but be unable to write to it.
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Reset the SMC, see this Apple note: http://support.apple.com/kb/HT3964
Also reset the PRAM:
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
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Firewire external mobil disk hard drive is no longer recognized

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