IMac Firewire voltage

I have a 2006 20" iMac 2GB Intel Duo Core and I've been having some trouble with bus-powering from my firewire (as detailed in this thread http://discussions.apple.com/thread.jspa?messageID=9874414&#9874414 ).
I measured the voltage with a multimeter and got a reading of 11.91 VDC on both my fw400 ports but I've read that Firewire should allow up to 30V.
Is 12V the standard on these iMacs or could there be some problem that is limiting the voltage?
Thanks in advance.

What the spec says that the standard is capable of doing, and what Apple builds into their Macs and allows FireWire to do are not the same thing. The current iMac supports up to 7 watts, the current Mac mini up to 8 watts on their FW 800 ports.
Dah•veed

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IMac firewire port is not working

iMac firewire port is not working
Hi everybody, Happy New Year.
I am a 72 years old semi-newbie in video editing, because Iedit only 1 or may be 2 movies a year since 2007 and I have only very little computer knowledge.
I received a new 27” iMac as a birthday gift 14 months ago. About 10 months ago, with help, I successfully use the Migration Assistant to transfer some datas from my old power G4 to the iMac including two Final Cut Express projects. I had one project successfully done; burned to DVD and I save it with Print To Video. Last week, I have my second project done, I burned the sequences into DVD but unable to do a Print To Videodue to the iMac is not communicating with my Sony camcorders DCR VX1000, this is the same camcorder I used on the last job which was working a couple of months ago.As a result, I try to switch the Easy Setup with different Format and different Use; I refresh the Canvas window; I did a Mix down; move the Screen Saver to NEVER as well as the Energy Saver set to NEVER SLEEP. I also trashed the preferences (plist) folders; run the Utility repair, I replaced the firewire cable (4 pines – 9 pines 800), but nothing work. Up to this point, I think that there is no signal from the firewire port to the camcorder because I understand when the sequences is ready, the firewire is connected between the computer and the recording camcorder, the Print to Video is activated, then the word DV- IN should be seen on the recording deck screen. This time, I don’tread such words on the recording screen. Therefore, I think there’s no out going signal from the iMac to the recording camcorder and the iMac is not receiving signal from the recording camcorder. At this point, I try to connect my iMac to the power G4 to see if I can do some data transfer. Follow the procedures, I hook up the data transfer cable between the G4 and the iMac, I can the fireswire icon moving on the G4 screen but no indication on the iMac screen (there should be some indications in the source bar), this shows me the iMac did not recognize the G4 which worked on previous data transfer. It looks to me the firewire port on my iMac is dead. What has gone wrong? Could I accidentally disabled the firewire port by some magic keystroke? (i.e. accidentally fat finger some thing to make it stop working? Oh, by the way, during the playing around, went to the Final Cut tool bar, I click the View >Video Out > Digital Cinema Desktop Preview – Main, the result was a black screen and the esc key was my rescuer - LUCKY LUCKY! Are there any other trouble-shooting techniques to apply before bringing to shop? Please help!
Sorry for such a long statement, forgive me for unable to make it shorter. Thank you for your patience. Thanks to all the folks in this board for being so helpful.
p.s.

Not sounding good.
If the system Profiler does not see it then there is a basic communication problem between camera and the Mac.
I'm thinking the Firewire port is the culprit as some 800 ports were faulty.
I'd suggest taking the Mac, cable and camera to your nearest Authorized Apple Service Centre and get them to diagnose the issue. eg. let them try to connect the two devices.
Right (control)click the Sequence icon in the Browser and select Item Properties, do the same for a clip.
You can also post screen shots for the Properties.
Al

Transferring my files from my 1.1 Mac pro to my new 5k iMac FireWire to lighting?

i Just ordered the replacement for my antique 1.1 version Mac Pro which is loaded with external FireWire hard drives as well as 3 internal 1 and 2 tearabyte and the one tearabyte SSD boot drive it is of course on 10.7.5 it also has a pair of apple cinama displays on from 2006 and the other from 2011
i just bought the machine below picking it up in a week and with it a pair of FireWire 800 to lighting adapters ....
my thought was to transfer my important stuff to the fusion drive via a FireWire 800 to lighting2 cable and the Apple transition software and then get a lighting 2 housing that will take the 3 internal hard drives and the internal SSD then chain my large external fire wire 800 drives and my FireWire brueray drive off of it with one of the adapters
does all this sound ok? I have not been able to find a lighting 2 drive case the takes the old mac pro drive sleds but can a good 4 or 6 bay lighting 2 extrrnal drive case be recomended?
as the old Mac Pro has windows XP sp3 as its boot camp I know it can not make the move.
I do have win 7 pro 64 as my boot camp on my mid 2009 Mac book pro already running Yosemite with all of the boot camp applications and data on an external F800 two tear drive from laci so my first thought was to use the orignal win 7 distrub DVD to create a new boot camp partition on the 3tera fusion drive but I am wondering if it would be better to set up the SSD in its new home as dedicated to the boot camp stuff with the existing win external drives....
Sorry for for all the questions but I am some one who made the transition from 400k to 800k to the first mac+ 5 meg hard drives to the SCCI world then to FireWire 400 then to FireWire 800 and I am hoping that this hopefully last migration for a while with be at least semi painless.... And as I near 70 I am not quite the geek I once was.
27-inch iMac with Retina 5K display
$3,349.00
With the following configuration:
4.0GHz Quad-core Intel Core i7, Turbo Boost up to 4.4GHz
16GB 1600MHz DDR3 SDRAM - 2x8GB
3TB Fusion Drive
AMD Radeon R9 M295X 4GB GDDR5
Apple Magic Mouse
Apple Wireless Keyboard (English) & User's Guide
Accessory Kit
AppleCare Protection Plan for iMac - Auto-enroll
$169.00

i was up until 4AM reading reviews and studying features and prices of every thunderbolt box i could find and in the end ordered the thunder bay 4 from new egg for $516.99 including shipping
as of today i found nothing better on the market for a thunderbolt 4 bay box i could have saved perhaps $35 by getting 2 highpoint dual bay boxes but the loss of versatility and perceived quality crossed that option off the list so OWC thunder bay 4 it is . it should get here just in time too
thanks again for the help

The Great iMac FireWire Mystery

I'm stumped on this one and was wondering if anyone had any suggestions.
A couple of months ago I replaced my mother's mirror door G4 (2x1GHz) with a 20" 2.16GHz Intel iMac (the last of the all-white iMacs). Her G4 had an 80GB and a 60GB internal hard drives, with the 80GB being the boot drive and the 60GB being accessed exclusively by Retrospect to do incremental backups on a nightly basis and a recycle backup once a month. This system worked quite well for the past couple of years.
Her iMac has a 250GB internal drive. I added a Newer Tech miniStack v2 200GB hard drive which I have connected via FireWire. Using the same Retrospect-based system, backups are performed regularly. However, there's a fly in the ointment. Occasionally and for reasons unknown the computer will unmount the FireWire drive all by itself. This happens regardless of whether the computer is idle or in use. Power cycling the drive will remount it and all is well afterwards -- until the next time. It seems to happen about once every 2-3 days. The drive can be connected for 2-3 days at a time without any problems, but then it just disappears. Poof.
Things to remove from the list right off the bat...
1. The miniStack drive is fine, having performed its duties on several other computers in the past and operating flawlessly in the same capacity on other computers (including a MacBook Pro and an aluminum iMac).
2. OS X is set to sleep the drive when it's not in use. Since the incremental backup process takes less than five minutes a day to complete, having the drive spun up 24/7/365 makes little sense. The drive happily spins up when Retrospect does its thing (assuming the drive is still on the desktop at that time, of course) and the drive happily spins down shortly after Retrospect finishes (again, assuming...). A suggestion of "turn drive sleep off" is not acceptable for this reason, and for the fact that the other computers that the drive was attached to also had drive sleep enabled and didn't have this problem.
3. The OS X installation (10.4.10) is very clean, having been installed when the iMac was installed. There are no "haxies" or anything weird like that installed. The only "modification" to the system is enabling the DEBUG menu in Safari. When I put the iMac into target disk mode and boot my wife's MacBook Pro from the iMac's hard drive, the miniStack drive does not show this problem. If the OS X installation was to blame then the MacBook Pro should also have lost the drive.
4. I've also gone the other way, booting the iMac from the MacBook Pro's OS (10.4.8 and 10.4.10) in target disk mode. The problem remains on the iMac.
5. The iMac itself has been checked out by Tekserve and the Apple Store, both in Manhattan, and has been pronounced 100% without error or problem. The iMac also passes the hardware test provided on the Apple CD and the TechTool Pro diagnostic. All other aspects of the computer perform flawlessly.
6. The FireWire cable has been replaced, and both the old and new cables are perfectly functional with all other drives and computers tested.
7. With one exception, other FireWire devices on the iMac seem to work flawlessly in all other regards. I've tried two camcorders, an iSight webcam, a friend's FireWire-to-MIDI box, a DVD burner, and a FireWire CF card adapter. All perform perfectly. The one exception is a 60GB portable FireWire hard drive. This drive performs exactly the same way on the iMac; that is; you can connect it and use it without a problem, but if you keep it connected for 2-3 days it too disappears from the desktop just like the miniStack drive. (I had a 2GB CF card connected to a FireWire CD card adapter, and it was mounted on the desktop as a formatted Mac volume. This card stayed on the desktop for five days without a problem, so the problem seems to be localized to actual hard drives and not just mass storage devices.)
8. The iMac performs perfectly in target disk mode. I had it in TDM connected to the MacBook Pro for several days and it never disappeared.
So, I'm at a loss. My current "fix" is to connect the drive to the iMac via USB and that seems to be working. That seems to indicate that it's a FireWire problem but I've never heard of one so specific to one particular category of hardware before (e.g., hard drives). Regardless, that doesn't solve this mystery. Yes, the drive works under USB....but why not FireWire like it should?

I have been having similar problems with a Mybook FW HD disappearing and remounting at random intervls. I am in the process of replacing it with a Fantom 1000.( I have a 300G Fantom with an Oxford chipsest that has been completley reliable for > 2yrs attached via FW400).
The Fantom 1000 mounted immediately with FW800, but as it was Fat32 formatted I decided to erase and reformat with MacOS extended using disk utility. I haven't been able to mount the final product, although it is recognized and described by the System. Disk utility can't verify or repair due to a formatting error.. I should mention that disk utility never gave any indication that it had finished the formating.. the blue barber pole was still spinning after 12 hrs
How long should it take to format a 1T disk?
Anyway now I am trying using a FW400 port and am about 1 hr into it...... next I will try USB and if that fails I will try to return to FAT 32... I should have quit while I was ahead
My question .... is this a FW problem, a Fantom problem or a formatting (Disk utility probem)

IMac FireWire Port Not Working

Hi guys, my system is a 24" 2.8GHz Intel-based iMac. Whenever I plug a device into the FireWire 400 port it powers the device but the iMac doesn't see the device - it doesn't show up in Disk Utility. There are no problems with the devices as they work perfectly with my other Macs. Any idea on whether I can fix this without taking it to an Apple Store? It seems like a Firmware issue.

Hi DrRGrant
First reset the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
Then if that doesn't work, give this a go: > http://support.apple.com/kb/HT1317
+1. Shut down the computer.+
+2. Disconnect all devices and all other cables, except the keyboard and mouse cable(s).+
+3. Disconnect the computer from the power outlet and wait for 3 to 5 minutes.+
+4. Plug the computer back in and turn it on.+
+5. Reconnect the device(s) (one at a time if there is more than one) and test. Test with each port if you have more than one.+
Dennis

27" iMac Firewire Question

Hi Folks,
I recently got the 27inch i7 iMac. I use it for Music Production and just general internet surfing.
My question is - I current use a Firewire audio interface (M-Audio Profire 2626) and with only 1 Firewire connection on the iMac.
Is it possible to plug a Firewire external hard drive into the back of my audio device, In a daisy chain type connection
(eg - iMac TO Audio Interface TO External HD)
to store my audio files and have no latency issues?
Any help on this would be greatly appreciated
BTD

Yes you can daisy chain them, the connection on your iMac is FW 800 so if your Profire only has FW 400 then you will need a cable like this. My suggestion would be to get an external HD that has 2 FW 800 ports (OWC Mercury, Lacie Quadra D2 or G-Tech) and you are set.
Regards,
Roger

IMac Firewire 800 port not supplying power

Hi,
The FW800 port on my iMac suddenly stopped supplying power to bus-powered drives.
The same drives work/mount when I use an AC adapter.
Have thoroughly trouble-shot (shooted?) the hard drives/cables on a different computer.
Tried the SMC reset (unplug for 15-seconds).
Anything else I can try before sending it to Apple?
System Details:
iMac
27-inch, Mid 2011
Processor 3.4 GHz Intel Core i7
Memory 16 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6970M 2048 MB
Software Mac OS X Lion 10.7.5 (11G63)

I only use one bus powered drive at a time.
Have been using them without issue since I got the iMac in 2011. The drives currently work fine on my MacBook Pro.
Here are the drives I use: http://eshop.macsales.com/shop/firewire/on-the-go
Bus powered RAID (2 drives): http://eshop.macsales.com/shop/firewire/EliteALmini/RAID/eSATA_FW800_FW400_USB
Genius Bar it is….

IMac Firewire limitations

I'm about to get an iMac to use mainly with Logic. I have an old MOTU 828 MK1 audio interface. That runs on Firewire 400. I understand that Firewire will always reduce speed to the lowest speed on the chain. There's only one FW port on the iMac, so daisy chaining would result in all my HDs running at 400.
Will this be too slow for audio tracks, samples, etc? If so, is there a hub option, or would I be better off with a new audio interface?
(I tried sorting this in the Regent St store, but they were too vague for comfort.)

I have an audio interface with 16 input @24bit96khz via a firewire 400, so i guess the 400 firewire channel should work fine for your needs.
Just beware that some motu interfaces, while being "firewire", rely on a propietary protocol to communicate with their propietary firewire card, so check your model carefully as they won't work with any standard firewire port.

IMac FireWire Audio Interface keeps disconnecting

I'm having an intermitten issue with my iMac, which worked (and still works) fine with my IBM based notebook. My firewire audio interface keeps disconnecting, it works fine for a while (could be anywhere between 5 mins to 2 hours) before completing not giving any output, it doesn't switch back to Core Audio during this time. However, if I turn in off and on again, it's fine again.
Any ideas?
More Info:
Audio Interface: Profire 2626
iMac 2011
OSX 10.6.8

PreSonus FIREBOX 24-bit/96kHz FireWire

IMac, firewire, drobo and camera

Hi guys,
I'm currently working off an old power pc-based mac pro and need to upgrade.
I'd like to get an iMac but am running into an issue: I think I need two firewire ports
I use a drobo drive, connected via fw and if I ever need to capture video, which I do at least twice a week, via fw I'd be screwed right? I'd have to disconnect the drobo drive and capture the video to the internal drive, unplug the camera, plug in the drobo and copy the files to the drobo.
Are there any other options???

Hi Nick
FireWire devices can be daisy chained one to another, check your Drobo Drive it should have a second FireWire port to connect your camera and other devices into.
http://support.apple.com/kb/TA26476
Likewise if your Drobo Drive is only FireWire 400, then you will need either a 400 to 800 cable or a 400 to 800 adapter to connect it to a new iMac's single Firewire 800 port.
http://www.amazon.com/Tripp-Lite-F017-006-Firewire-Hi-speed/dp/B000AAZQLI/ref=pdbxgy_e_textb
http://www.amazon.com/elago-FireWire-400-800-Adapter/dp/B002TF0ZDQ/ref=pdcp_e2
Dennis

IMac firewire problems - anyone just replace them?

hi. i know there have been a lot of problems and a lot of posts with the FireWire busses on the aluminum iMacs. I know no Apple solution has been released. But i'm wondering if anybody has had their FW busses on their iMac replaced with a bus using a different chipset than the Agrere(sp?) set. is this possible even? if this ridiculously complicated?

Since the Firewire is soldered onto the logicboard, you'd need an entirely different logicboard design. Unless Apple has used other chipsets, which is unknown, I don't think that's possible. It is more likely one of the issues outlined here needs to be addressed if you are having Firewire problems*:
http://www.macmaps.com/firewirebug2.html
- * Links to my pages may give me compensation.

Imac firewire problems

I have a 27" late 2009 imac running os x 10.8.5 The I plug a presonus firestudio mobile to it and it does not show up. I plug it to 2 other mac and it showed up.
What is the problem. Do I have a bad firewire? If i do is it a way i can test it?

Hello Enthomas,
Thank you for using Apple Support Communities.
For more information, take a look at:
USB and FireWire Quick Assist
http://support.apple.com/kb/ht1151
Have a nice day,
Mario

Imac firewire cable

Hi all
I was given a imac CRT 600mhz and the prior owner included a cable with firewire connection at one end and the other end I'm not sure what it connects to but it has a small female port connector with apple icon. It looks like a cable for camcorder capability.
Thanks for your help
Web dude

I can't see a question above so I assume you're asking for confirmation(?)
That's a 6pin-to-4pin Firewire 400 cable.
My iMac DV 400MHz came with one and I still use it with my DV Camcorder today. Many PCs especially laptops use the 4pin "Firewire" aka "iLink" aka "IEEE1394" connector rather than the 6pin "Firewire" connector we are used to on the Mac. The 6pin is the superior connector. It's more physically robust and can power the external device (like portable hard disks); the 4pin connector cannot. I've only ever seen DV Camcorders with the 4pin version.
cheers
mrtotes

IMac firewire issues...

Hi all
I'm wondering, after having recent problems with using a Metric Halo Mobile I/O and a USB hard drive at the same time (massive latency issues, crackles, etc. in Logic Pro 7), if anybody has any more information on it.
I read that there is only Firewire bus on the iMac that I have and that is the problem - is there any way around this or is my second Firewire socket just a waste of time when the Mobile I/O is connected?
Any thoughts welcome! Or, of course, feel free to point me in the direction of any previous discussions I've missed.
Thanks.
Steve

Most (all?) Macs have only a single Firewire bus, but that doesn't stop me, or others, from using a FW audio interface and a FW hardrive together.
Your post says you were using a USB hard drive, that's totally different from Firewire.

IMac firewire Apopgee Ensemble and Glyph hardrive question

Howdy! I have a brand new iMac 2.93 Question about firewire and a Apogee Ensemble and a Glyph GT050 hardrive. Neither of these came with the proper firewire cable for the iMac. Can someone tell me what kind of firewire cable I need to hook this up? Can I daisy chain the Glyph into the Ensemble? I'd rather not use USB for the Glyph. I've tried in vein to find the answer. Thank you in advance!!!

You just need an adapter like this one. You don't need a hub.
Then, as Jorge said, you can daisy chain your Ensemble and your HD using a standard FW 400 cable. After that, it's just the order to experiment with: some interfaces like being first in the chain, some last, and most don't care. You'll find out very quickly if this is an issue with your system (probably not).

IMac Firewire voltage

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