Unknown firewire device

Hello,
I've had some recent freezes (usually during logout from one account to another or shutting down). After a hard reboot, startup is long and external drives will not mount at times. After, switching cables and ports for the external drives (2 firewire, 1 usb (timemachine) it seemed to alleviate the problem but not entirely. After checking system profiler, my firewire bus lists my 2 external drives plus this:
Unknown Device:
Manufacturer: Unknown
Model: Unknown
Maximum Speed: Up to 400 Mb/sec
Connection Speed: Unknown
After ejecting the existing firewire drives, profiler still says this 'unkown device' is on the firewire bus.
Could this be related to recent freezes and drives not mounting properly?
Any thoughts would be appreciated -- thanks much.
Quad g5
6GB RAM

Hi. Seem to remember some discussion a while back about it being a good idea to disconnect any FW400 devices and reset the FireWire bus before any heavy FW800 work, such as cloning - because the combined FW800/400 bus on the G5 can get stuck at the 400 speed...
Anyway, after the hard Shutdowns, you could try running Disk Utility > Verify Disk to check for directory problems - if any are found you can use the 10.5 retail disk in this process
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1018.html
and reset the FireWire (last bit on the page here)
http://docs.info.apple.com/article.html?artnum=88338
Good Luck.

Similar Messages

Firewire Device unknown message - Macbook Air

Hi,
So I have an old Canon Digital Camcorder and I want to grab all the old movies of the kids, so I purchased a Thunderbolt/Firewire adaptor from Apple, plugged it into a 9pin to FW800 cable and powered everthing up, opened iMovie and no camera appeared, checked Finder and nothing.
So I checked System Information and under Firewire devices, I see the message "Device Unknown".
So I started searching the web for drivers and nothing is coming up, so I am wondering what I can do ?
I don't want to go back to my old IBM X32 thinkpad as it struggles to capture the data stream.
Thanks
Carl.

Hi Carl,
If you are having issues transfering your video from an older Firewire camcorder, you may find the following article helpful:
iMovie '11: Import video from a tape-based (FireWire-equipped) camcorder
http://support.apple.com/kb/PH2144
Regards,
- Brenden

Kernal panic - log mentions firewire repeatedly but no firewire device

Hi Guys,
Any help appreciated with this. Firstly although my profile states leopard+ macpro this relates to a G5 running 10.4.11. We had a kernel panic earlier on a machine that has seemed buggy over the last few days (in spite of running Applejack). Weirdly the log mentions firewire repeatedly in spite of no device being mounted (there is a drive plugged in but not mounted + powered off). Ran verify disk + repaired permissions (nothing needed repairing) afterwards. Any ideas? Thank you.
panic.log:
Description: Panic (system crashes) log
Size: 7.61 KB
Last Modified: 19/12/2008 16:27
Location: /Library/Logs/panic.log
Recent Contents: ...
Backtrace:
0x002B98A0 0x002FEA4C 0x002FE8C0 0x002B7A98 0x002B7AEC 0x0008A6C0
0x0008A730 0x000291D0 0x0001AB84 0x00029574 0x00048DFC 0x0001D9CC 0x0001FD7C 0x000215CC
0x00038040 0x00263A78 0x00270200 0x00025250 0x000AC0B8
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOFireWireAVC(1.8.1)@0x590000
dependency: com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
Proceeding back via exception chain:
Exception state (sv=0x319F4780)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x3175BA00)
PC=0x90031C64; MSR=0x0000D030; DAR=0xA000C9F8; DSISR=0x0A000000; LR=0x90052328; R1=0xBFFFA420; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.2.2: Mon Aug 22 18:43:11 PDT 2005; root:xnu-792.5.11.obj~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x00095698 0x00095BB0 0x0002683C 0x000A8304 0x000ABC80
Proceeding back via exception chain:
Exception state (sv=0x319F4780)
PC=0x005651CC; MSR=0x00009030; DAR=0x11EB9000; DSISR=0x40000000; LR=0x0059FC2C; R1=0x177F3840; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002B98A0 0x002FEA4C 0x002FE8C0 0x002B7A98 0x002B7AEC 0x0008A6C0
0x0008A730 0x000291D0 0x0001AB84 0x00029574 0x00048DFC 0x0001D9CC 0x0001FD7C 0x000215CC
0x00038040 0x00263A78 0x00270200 0x00025250 0x000AC0B8
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOFireWireAVC(1.8.1)@0x590000
dependency: com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
Exception state (sv=0x3175BA00)
PC=0x90031C64; MSR=0x0000D030; DAR=0xA000C9F8; DSISR=0x0A000000; LR=0x90052328; R1=0xBFFFA420; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.2.2: Mon Aug 22 18:43:11 PDT 20050
Thu Aug 14 14:56:19 2008
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000000 PC=0x00000000002FA4D8
Latest crash info for cpu 0:
Exception state (sv=0x61A82C80)
PC=0x002FA4D8; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x002FA4D4; R1=0x46803C30; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002FA4D4 0x62A9E554 0x62A9E66C 0x00302900 0x00302984 0x002FB00C
0x0003CA1C 0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.StorageLynx(1.5.1)@0x62a9d000
dependency: com.apple.iokit.IOFireWireSBP2(1.7.5)@0x61575000
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(1.4.9)@0x557000
dependency: com.apple.iokit.IOFireWireSerialBusProtocolTransport(1.4.4)@0x61593000
dependency: com.apple.iokit.IOFireWireFamily(2.2.5)@0xa37000
Proceeding back via exception chain:
Exception state (sv=0x61A82C80)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x78946000)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000A8204 0x000ABB80
Proceeding back via exception chain:
Exception state (sv=0x61A82C80)
PC=0x002FA4D8; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x002FA4D4; R1=0x46803C30; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002FA4D4 0x62A9E554 0x62A9E66C 0x00302900 0x00302984 0x002FB00C
0x0003CA1C 0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.StorageLynx(1.5.1)@0x62a9d000
dependency: com.apple.iokit.IOFireWireSBP2(1.7.5)@0x61575000
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(1.4.9)@0x557000
dependency: com.apple.iokit.IOFireWireSerialBusProtocolTransport(1.4.4)@0x61593000
dependency: com.apple.iokit.IOFireWireFamily(2.2.5)@0xa37000
Exception state (sv=0x78946000)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x0000
Fri Dec 19 16:27:19 2008
panic(cpu 1 caller 0x000E83E4): vnode_put(7f5a210): iocount < 1
Latest stack backtrace for cpu 1:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000E83E4 0x000E8390 0x0010DECC 0x0010E144 0x0010E368
0x000FBA54 0x000E249C 0x000E2030 0x000F51A0 0x000ED4E0 0x000ED898 0x002ABDB8 0x000ABD30
0x6963743E
Proceeding back via exception chain:
Exception state (sv=0x6192B780)
PC=0x90001B2C; MSR=0x0200F030; DAR=0x003E6004; DSISR=0x40000000; LR=0x00005488; R1=0xF0303D50; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC

The KP does look Firewire connected; so unplug it.
Understanding crash logs isn’t easy and it’s hard (sometimes impossible) to decipher the cause of the problem. Take a look at Apple’s Crash Reporter document at http://developer.apple.com/technotes/tn2004/tn2123.html
Also look at Tutorial: An introduction to reading Mac OS X crash reports
http://www.macfixit.com/article.php?story=20060309075929717
Kernel panics are usually caused by a hardware problem – frequently RAM, a USB device or a Firewire device. When trying to troubleshoot problems, disconnect all external devices except your monitor, kbd & mouse. Do you experience the same problems?
If you suspect RAM,look at this link: *Testing RAM* @ http://guides.macrumors.com/Testing_RAM Then download & use Memtest & Ramber.
May be a solution on one of these links.
Resolving Kernel Panics
Avoiding and eliminating Kernel panics
12-Step Program to Isolate Freezes and/or Kernel Panics
 Cheers, Tom

Latest OS X update makes firewire device disappear!

I applied the latest update to OS X and now it doesn't see my outboard disk drive that's firewire. How can I make it see the device? "About this mac" says unknown firewire bus.

I have upgraded to Mavericks 10.9 and all of my external disk drives, all of which use Firewire, still appear and function normally.
Could maybe provide more details so that we can help you?
Allan

Firewire devices no longer showing

This afternoon - for the first time in years - no firewire device showed up either on the Desktop or in the Apple Profiler.
Restarted several times with no success.
Devices on Firewire 400 (via bus) external CD reader/writer and DVD ditto.
Devices on Firewire 800, three LaCie drives linked together. Tried each one separately, no success.
Which is bit of a pain, these being my backup and ancillary storage devices ...
Disconnected them all. Restarted G5. Closed down and left G5 for half-an-hour (following a suggestion in a forum). Reconnected, restarted; no joy.
Console message includes:
Jun 6 14:50:03 localhost kernel[0]: FireWire (OHCI) Apple ID 42 built-in now active, GUID 001124ff fe86cb20; max speed s800.
and then, at the bottom of the report:
Jun 6 14:52:47 SarahJane kernel[0]: FireWire (OHCI) Apple ID 42 built-in: no valid selfIDs for more than 2 minutes after bus reset.
Jun 6 14:55:59 SarahJane kernel[0]: FireWire (OHCI) Apple ID 42 built-in: no valid selfIDs for more than 2 minutes after bus reset.
Jun 6 14:59:11 SarahJane kernel[0]: FireWire (OHCI) Apple ID 42 built-in: no valid selfIDs for more than 2 minutes after bus reset.
Can anyone help, please? I've run all the usual things, hardware check, diskwarrior, techtool (though none of these seem to check the firewire bus).

Right - had a look through, and after two attempts (mutter mutter and splutter curses) got everything going again.
The cure was, in this case, as listed in your first link: disconnect computer etc.
The first time the CD reader came back but the external drives wouldn't, so I said a few words that my wife would not approve of, then tried again but this time connected the (800 fw) external drives first, and then, when the buggers showed up, connected the cd drive on the 400 cable. I think the dvd drive on the 400 has died, so I'll leave that disconnected.
Oh it's a great machine when it's running right, it's a lovely gadget to play with; but when something goes wrong it can be very frustrating ...
I sometimes wish I'd had one of these when I was still at school and a little quicker on the uptake.

Problem connecting Firewire device and external HD at the same time

Hi. I'm attempting to record digital audio through a Presonus Firepod A/D interface via a Firewire 400 to 800 cable connected to one of the Firewire 800 ports on a mid-2010 Mac Pro running Snow Leopard.
The problem is that if I have an external HD connected to one of the other Firewire 800 ports on the computer and powered on at the same time, the connection to the Presonus Firewire device is not recognized by the Mac Pro. Not only that, performance of the Mac Pro is affected adversely and System Profiler is unable to list any Firewire devices. If I turn the external HD off, the Presonus device is recognized and listed in System Profiler and the machine runs fine. I'm able to connect two external hard drives via separate Firewire 800 ports on the Mac Pro and both drives mount w/ no problem. It's only when I try to connect one of the external HDs and the Presonus audio device at the same time that the problem occurs.
I used this same arrangement on a PowerMac G5 running Tiger w/ no problems whatsoever. If the 400 to 800 cable is bad, I would think it wouldn't work at all, but it does when only the Presonus Firepod is connected and powered on. Any ideas?

Have done more research and apparently this is not an uncommon problem: overloading the Firewire bus when connecting an audio device along with an additional device like an external hard drive. As I understand it now, audio signal is a bandwidth hog and the solution is to get a Firewire PCIe card which will have its own independent Firewire bus and which I'll use exclusively for my audio device.

Using Firewire devices results in desktop stuttering

Firewire traffic is causing desktop performance to decline. On my Mac Mini (late 2009, 4 GB RAM) even slow amounts of firewire traffic is causing bad spaces performance (stuttering while moving from space to space) and jerky window movement. I have tested this with several cables and 2 different firewire devices. Device 1, a Canon HDV camcorder, is bringing the window movement to stutter when imovie is detecting the connection and showing the import screen (no transfer initiated, not even playback). Device 2, a Western Digital My Book Studio with FW800 ports, is making the desktop jerky even if it is only playing a mp3 file.
Notes:
Spotlight was disabled on the mentioned fw800 hdd. Disk activity monitor shows normal operation, very low cpu workload. The system log also does not show any suspicious messages.
USB devices like harddisks do not trigger this behaviour. The mentioned fw800 disk also has an USB port. Connecting the device using USB does not slow down desktop performance, even when transfering large files.

Thanks for you suggestions. I tried them out (and some more).
Here are the results:
You can test to see if the Virtual Memory system is getting overworked by running Utilities Activity >Monitor, click on the System Memory tab and look at PageOuts and PageIns.
I kept an eye on the virtuel memory for a while now. Seems to be fine, even after hours of my usual working procedure there are virtually no page outs.
But if your ratio is good (10% or less), then I'm would suspect instead that you need to re-install a >full combo update of the latest version of OSX.
I reinstallad the 10.6.4 Combo Update. No difference.
Then I installed a fresh copy of OSX on the firewire drive. Running an unpatched OS from the drive is not bad in regards of system response time (actually it's pretty good). But the desktop jerkyness is present all the time.
Then (after switching back to my internal drive again) I stopped keeping an eye on window movement etc. and tried out some games. The results: There is a major difference in performance when the fw drive is working in the background in contrast to an usb2 drive (or even the same fw drive attached using usb). When I am playing the game (in this case it was an opengl port of Doom) there is virtually no performance penalty when I am playing the game while transfering a huge file to an usb2 drive in the background. But when I am transfering a file to the FW drive, there is huge drop in frames per second (roughly 25 - 30 %).
I am wondering if this has anything to with fact that firewire is using dma access to the system memory (in contrast to usb) an there is some sort of congestion on the memory bus. Especially since my issues are linked to gpu performance and the 9400M in the Mini uses shared memory.

OS X Mavericks won't recognize firewire device

I updated to mavericks and my firewire device is no longer recognized. It is an alesis io 26. i use it for home recording. The system preferences won't recognize it, and my software program (logic pro8) will not recognize it either.

Not so sure Logic 8 is compatible with Mavericks:
https://discussions.apple.com/message/23971178#23971178
MtD

Firewire device looses connection when external screen is inserted into the thunderbolt port? HELP

HI
I am a recording studio engineer. Ive got a Firewire AD/DA Converter (Focusrite Saffire Pro 56) running from my Firewire port of my MacBook Pro, which is running OSX Mavericks. I've also got an external Screen I want to use as an extended display. I'm using a HDMI cable from the screen to a HDMI to Thunderbolt Converter which I then plug into my Thurderbolt Port.
As soon as I plug the screen in, the Firewire Port looses connection completely and I cant use or even choose the Saffire Pro 56 as audio driver. Another thing happens where the Thunderbolt port replaces the Saffire Pro 56 Driver with the screen as the audio output source.
Please help, there's nothing I can find to fix this.
Thanks Maurice

You don't mention which model you have, but this is from the M-Audio Firewire 410 Manual Troubleshooting section:
The FireWire 410 has been designed to give you high performance and professional quality audio. It has been tested under a wide range
of systems and operating conditions. In the real world, however, there is a nearly infinite number of possible operating scenarios, any of
which could affect your system’s performance. Much like owning an automobile, “your mileage may vary.” This section can not begin to
cover all possible issues you may encounter, however we want to give you some suggestions on common problems you may experience.
One thing to avoid is connecting too many devices. The FireWire bus is a dependable, high-speed, high-bandwidth protocol which is ideally
suited for digital audio. Nonetheless, it’s important to remember that audio and multimedia streaming places considerable demands on
your processor and the FireWire bus. Although it is theoretically possible to chain many multiple FireWire devices in series, doing so may
potentially degrade your audio performance.
I guess this degradation could also affect the Firewire HD. Maybe there is a simple fix, but it sounds like the M-Audio people have been down this road before.

Anyone able to mount more than 3 firewire devices on their Alum 2.4 imac?

Hi.
I can't power up more than 3 firewire devices or my imac kicks everything off. I have 2 Lacie 1T drives piggybacked on the 800 port and then a powered firewire hub plugged into the 400 port. I can have either another firewire external HD OR an external Cd/Dvd recorder plugged into the hub. If I try both (or any combination of 2 firewire devices) - the imac kicks everything off firewire, both on the 800 port and the 400 port. All my devices have their own external power supply. It also doesn't matter how I chain the drives. I can have 3 on the 800 port but then nothing on the 800 port.
This is a bummer for me. I migrated from a Dual G5 2GB with 4 external HDs and an 2nd external DVD writer attached. My drives are 2 1Ts, a 800 GB and a 400 GB. I do a lot of photography and video editing so I really need the external space. I guess this imac really isn't a "Pro" model but I didn't need any more speed and I wanted to save space and money. And I love the 24" screen. I think Apple should say up-front if there are significant limits to the imac's Firewire capabilities.
Are any of you you able to attach 4 firewire devices at one time? If so, then I guess my machine is defective and I'll start working with Apple on exchanging it. Please let me know.
Thanks

I think you should be able to do much more than 4 - I believe the theoretical maximum is somewhere at 20+ devices (if they are self-powered). I don't have a 24inch but instead a 20 inch but I'm running three HDs and one DVD drive and in fact, all daisy-chained onto one single firewire port on the Mac. Do your external drives have two ports or just one? In the former case, you might want to try skipping the hub and just daisy-chaining them. I've never owned a firewire hub so I don;t know if they can be touchy but you might want to give it a shot.
Andrew

Thunderbolt to firewire adaptor does not work when daisy chaining firewire devices

Hi,
I just purchased the Thunderbolt to firewire adaptor for my new late 2012 iMac.
It works when connecting a single firewire device, but when I daisy chain another drive, the first drive disconnects and nothing mounts.
I am trying a Hitachi G-Raid and a couple of WD My Studio II hard drives. They all work when connected directly to the adaptor, but not when more than one drive if daisy chained with firewire.
Has anyone got firewire daisy-chaining working with a thunderbolt adaptor? (just to clarify I am not refering to thunderbolt daisy chaining, as the adaptor is an end-of-chain thunderbolt device).
Thanks

Yikes, that's sad to hear.
I can't test it, no TB here, but are all these drives self AC powered, ie. no bus powered drives?

Attaching VGA video adapter and Firewire device

I'm using the VGA video adapter to attach my brand new Mac mini to a VGA screen. As the space between video port and Firewire port is too narrow with the VGA video adapter attached I can't connect any Firewire cable!
Anyone who knows how to connect VGA video adapter and Firewire device at the same time?

The DVI-VGA adapter I got with my last mini was barely wider than the video port on the back of the mini and since a firewire connector is also barely wider than the FW port itself, there was no problem connecting to both at the same time, with a small but distinct space between. Indeed, it's about the same space as between the adapter and a cable plugged into the nearest of the USB ports on the other side.
If you're having problems, you might find that connecting the firewire cable first might help, but otherwise either the adapter or the connector on your firewire cable is non-standard. If you still can't connect both, take the mini, along with your firewire cable and the DVI-VGA adapter to an Apple store and ask them to try.

Trying to use FireWire devices with a W540 through a Thunderbolt adapter

We have a camera that we need to use that has FireWire 800 as its sole interface, and because it needs to be mobile we had to use it with a laptop. After some research we decided that the best course of action was to purchase a ThinkPad W540 and connect the camera to the Thunderbolt port with a Thunderbolt to FireWire Adapter, as this should give us plenty of bandwidth for the camera.
Unfortunately, we haven't been able to connect any FireWire devices to the laptop in this way. We have tried connecting both the camera and a FireWire hard drive through the adapter, and while the power lights will come on for both devices the computer resolutely refuses to even acknowledge their existance.
I have tried everything that I can think of to get this to work, updating all of the dirvers on the laptop, checking all of the settings in the BIOS, and searching the forums for similar issues, but now I have run out of ideas. What can I do to get this laptop to play nice with my FireWire devices?
Solved!
Go to Solution.

Good afternoon and welcome to the community.
Sorry you're having issues using a Thunderbolt-2-Firewire adapter.
Not much I can offer on that as I've never used one, but an alternative might be to try an Expresscard Firewire adapter. A number of them I've seen offer 2 ports, so that might be useful also.
Regards.
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G5 xserve: How do I boot from a FireWire device ?

Hi.
I have a PowerPC G5 server WITHOUT a keyboard/display and have just installed Leopard 10.5.1.
After setting up Leopard, I made a backup copy of the server HD onto a Lacie FireWire hard-drive device connected to the FireWire 400 port on the front-panel using Carbon Copy Cloner v3.
The backup appeared to work fine.
However, when I tried to boot from the FireWire device by holding down the system identified button at the same time as the on/standby button and then selecting Light 4 (to quote page 65 of the G5 User Guide… “bypass the current startup disk and start up from any other available startup disk”) nothing happened. Instead, the fans just got louder and louder and louder and louder, with the occasional flash of FireWire device and HD lights. I switched it off after 10 minutes and re-booted as normal from the HD device.
Any suggestions ?
Thanks in advance,
john

Tony,
Having thought about this and read Apple's article "how to use FireWire target disk mode" (http://docs.info.apple.com/article.html?artnum=58583), let me play back what I think have to do...
Assumptions...
a) A working Leopard system.
b) I want to go back to yesterday's backup.
c) I can't use Time Machine as it's an "Advanced" install.
d) My backup is done via Carbon Copy Clone onto my external FireWire device.
Is this what I would do... ?
1) Get my PowerBook G4 laptop, which is also running Leopard !
2) Switch off the Xserve G5.
3) Connect the FireWire backup to THE LAPTOP !
4) Connect the laptop to the Xserve using a FireWire cable.
5) Switch on the G5 and hold down the system identifier button.
6) When the lights rotate select Light 5 "Begin target disk mode".
7) On the laptop an icon would appear which is the Xserve HD.
8) Using the laptop, I then copy from the FireWire backup to the Xserve HD icon.
(I guess, as the fans may be running flat out at this point !)
9) After the backup then eject the Xserve HD icon.
10) Disconnect FireWire cable.
11) Re-boot Xserve
12) Should be running yesterday's backup.
13) Relax !
Blimey !
john

"Unknown USB Device"

I got my 2GB nano last Monday. I could successfuly install it on my laptop and upload some songs to it. That done, I wrapped it again and gave it to my wife, so she and the kids could "surprise" me for my Birthday. Yesterday I got it,listened to the "sample songs that came with it", and today I tried to upload some more songs, but to no avail. Everytime I plug it in, all I get is an error message from windows, stating "Unknown USB Device". I tried everything from the iPod support site and from Windows help, but the nano simply won't be recognized. Oh, I tried to hook it up to my desktop at home as well, but nada as well. Same message.
Is my cable fried? Is my iPod connector fried? Can someone pinpoint the problem?
To worsen things even further, I live in Brazil, where the first nanos won't be around until Christmas, and support is but a dream...
Help!
Ruy

These steps should help you with the 'Unknown USB Device' issue, Ruy:
First, make hidden folders visible. Open My Computer and choose Tools/Folder Options/View tab. Click on 'Show hidden files and folders' and click OK.
In the Add New Hardware Wizard, have it search in C:\windows\inf for usbstor.inf. This file is required for windows to properly configure the driver. If Windows finds the driver there, you're done.
If Windows does not find the proper driver there, copy usbstor.sys from C:\windows\servicepack\i386 to C:\windows\system32\drivers.
If you can't find the usbstor.inf file on your system, you can get it here: usbstor.inf
After copying the usbstor.inf driver file to C:\Windows\inf, right-click on My Computer and choose Manage.'
Click on the button labeled 'Device Manager.'
Click to open the list under 'Universal Serial Bus Controllers.'
Right click on any mass storage devices with the exclamation icon next to them and select 'Update Driver.'
Check the option 'Install from a list or a specific location' and then click to continue.
Check next to 'Include this location in the search' and enter 'C:\windows\inf'.
Click on 'Next' and follow the steps to complete the driver installation wizard.

Unknown firewire device

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