Help please: iOmega external HDD not mounting

Hello,
I hope someone can help me 1) solve this problem and 2) give me some tips on how to avoid if it was self induced.
My iOmega external HDD won't automatically mount. It does not display in Disk Profiler. In System Profiler I can see an unknown Firewire device which I believe is it. It has data on it currently so I'd prefer not to have to format it! I tried searching some other threads but they tend to be very specific.
Thanks!

Hi, za_. Is this a bus-powered portable USB2 drive? If so, it probably demands a little more power than the port it's connected to can provide. In that case, the problem can be resolved by supplying power to it from (a) an auxiliary power cable that draws additional power from your Powerbook's second USB port, or (b) its own AC adapter, if it came with one, or if one is available as an option for it. If the drive enclosure has no port on it for an auxiliary power input, then (c) you'll have to interpose an AC-powered USB hub between the computer and the drive. Option A is the best, because it isn't bulky and preserves the portability of the drive. Option C is the worst, because it's the bulkiest of the three.
If your drive isn't a 2.5" portable unit, please supply exact details about what model it is and how it's powered, and we'll see about other explanations for the problem.

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Linux arch.aneder.hu 2.6.31-ARCH #1 SMP PREEMPT Tue Oct 13 11:33:39 CEST 2009 x86_64 AMD Turion(tm) 64 X2 Mobile Technology TL-60 AuthenticAMD GNU/Linux
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Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 04f2:b028 Chicony Electronics Co., Ltd VGA UVC Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 152d:2329 JMicron Technology Corp. / JMicron USA Technology Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 04f2:b028 Chicony Electronics Co., Ltd VGA UVC Webcam
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Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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Initializing USB Mass Storage driver...
scsi6 : SCSI emulation for USB Mass Storage devices
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usb-storage: waiting for device to settle before scanning
usbcore: registered new interface driver usb-storage
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sd 6:0:0:0: Attached scsi generic sg2 type 0
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sd 6:0:0:0: [sdb] Mode Sense: 34 00 00 00
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sd 6:0:0:0: [sdb] Assuming drive cache: write through
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sd 6:0:0:0: [sdb] Assuming drive cache: write through
sd 6:0:0:0: [sdb] Attached SCSI disk
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usb 2-3: device descriptor read/64, error -71
usb 2-3: reset high speed USB device using ehci_hcd and address 2
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usb 2-3: device not accepting address 2, error -71
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Help please: iOmega external HDD not mounting

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