Firewire 400 external device on an MacBoook Pro Firewire 800

I have an external Hard drive a generic 120GB hard drive with a standard Firewire 400 port. I used it as an HFS drive with periodic backups to and from my old Powerbook G4 10.4 before the logic board died. Drive worked 1 month prior to the Powerbook's death.
I purchased a new Macbook i5 10.6.4, a much needed upgrade. Since it has a Firewire 800 port I purchased a 400 to 800 adapter from an online retailer. Once I plugged in the new firewire addapter the drive showed up as expected as a /Volume/Backup112.ZF. However the beach-ball of death showed and I could not read the drive. Terminal I could cd to the volume, but not list. In Terminal Testdisk application (Mentioned later) was able to list disk information as well as diskutil. The firewire would not unmount cleanly. Pulling out the connector only gave a message that drive was not unmounted cleanly and remained mounted... sudo diskutil unmount /Volume/Backup112.ZF did not work. Kill and restart of Finder only crashed the computer. Computer works great and after a hard reboot.
Multiple tries to get a error log got me nowhere. I could post disk information, but that would only show that the drive has read but not write permissions.. I did find multiple postings about using a 10.5 OFirewireSerialBusProtocolTransport.kext. I do not have a 10.5 disk to get the file off to download. http://discussions.apple.com/thread.jspa?threadID=2136580
There seems to be an indication that Apple knows about the problem? Is there a developers forum where I could read what they are saying on the fix? I have an apple One Account, would it help to get in touch with the advanced staff? I have not seen any firewire problems like this in Unix. Are there any Unix people out there well versed in Firewire? Otherwise, Looks like I will be doing more research...
FYI:
NTFS read/write without software install. This works perfectly in 10.5-10.6 without any issues for my Windows to Mac drive. Too many people make it more difficult then it needs to be. To figure it out, just needed to know Unix.
1. NTFS auto-load read and write enable
sudo mv /sbin/mount_ntfs /sbin/mount_ntfs.orig
vi /sbin/mount_ntfs
#!/bin/sh
/sbin/mount_ntfs.orig -o rw "$@"
sudo chmod 755 mount_ntfs*
sudo chown root:wheel mount_ntfs*
2. NTFS boot sector fix
TestDisk from http://www.cgsecurity.org/wiki/TestDisk.

Well, at least I know that everything SHOULD be working as it did briefly this evening. I'm at a dead end . . .can't think of anything else to try.
Guess I'll just have to pick up another adapter tomorrow and see if that helps.

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Conflict between Logic Pro and external device error in Logic Pro X./cpu problems

hi Logic users,
using a MacBookPro 15 inch Retina, 2,7 GHz intel Core i7, 16 GB Ram, OSX 10,8,5, Logic X 10.0.4.
i am wondering if you can help me out with the following problem i cant solve:
when starting logic x with a not too big arrangement, lets say using one third to half of cpu, i open u-he plugin Diva and the cpu is going up on full range and the following error appears: "sample-rate 39299 (number always changes) reconized. Check conflict between logic pro x and external device"
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putting the sample buffer up to the highest rate, doesnt change anything.
same arrangements on friends computers dont show that problem, so it has to be something wrong in my set up.
anybody has an idea?
would be much appreciated for your help,
thanx-

Have you used Diva's preset Accuracy system to reduce CPU load?
accuracy
Click on the Main button at the bottom of the window. To the right of the Master section are two selectors called Accuracy and OfflineAcc. In the current version of Diva these are global parameters i.e. they remain fixed across all presets, per loaded instance:
draft........CPU-friendly, but FM will sound rough and resonance is primitive i.e. NOT zero delay! fast......... Fine for older computers and/or when you need more polyphony in acceptable quality great...... The best compromise between quality and polyphony on high-power computers divine..... Top-quality zero delay feedback filters... but can your computer can handle it?
OfflineAcc only has two options – same or best (i.e. divine in the current version).
Some host applications may have problems rendering to audio at the selected accuracy, but the
better ones include an “inform plug-ins of offline rendering status” or similar.
I typically work in draft mode and then switch to Devine or best when freezing the track or bouncing the entire project...

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Short version...
Shut everything down
Unplug everything
Go have a nap, Guiness, Harpoon, Cafe Colåda, Hot Chocolate, talk a walk...anything to occupy 15 minutes or so.
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http://www.digitalrebellion.com/pref_man.htm
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K

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I have a mixed group of external drives, and just bought a new OWC Mercury quad interface drive.
The user manual that came with it says:
Note: If you are using FireWire 800 and add a FireWire 400 device to the chain, all devices will be reduced to FireWire 400 performance
I tested this myself, which confirmed it. I set up the following chain, with the first 2 drives connected by FW800, and with a FW400 drive either connected or not connected at the end:
HD ----800-----DRIVE1------800------DRIVE2-------400-------DRIVE3
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HT201257 hardware test using an external optic device (iMac) on macbook pro 9 years old via firewire. What to do? and how to do it?

hardware test using an external optical device (iMac) on macbook pro 9 years old via firewire. What to do? and how to do it?
I thiunk the graphic card is defective and need to run hwt

You don't.
Need a internal optical drive and the Hardware Test on disks is old and outdated anyway.
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Here's the deal. Currently running SL 10.6.8 on a MAC Mini. Planning for eventual upgrade to ML. Have a 1TB external hard drive partitioned into two volumes, one volume for Time Machine and one volume for SL which I periodically update using Superduper. Thus I always have a point-in-time bootable backup on the external hard drive.
The MAC Mini supports Firewire 800. However, booting from my current external hard disk is pretty slow, since it only supports Firewire 400. I am considering buying an Iomega MiniMax which supports Firewire 800. Then, I would use the MiniMax as my bootable backup volume, and relegate the older hard drive to Time Machine.
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Obsessive-cumpulsive? Yep. Anal? You got it. That's why I'm in the DR business.

You may have overloaded the port, following the instructions below it should reset:
+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.+
http://support.apple.com/kb/HT1317?viewlocale=en_US

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Hello,
I just got the external harddrive "Seagate FreeAgent GoFlex USB 3.0 1TB" with a Seagate FreeAgent GoFlex Upgrade Kabel FireWire 800. I have neither a USB 3.0, nor a Firewire 800 on my white macbook (2008). I already know, that it's possible to use USB 3.0 with an USB 2.0 port, but I would like to use it with the firewire to spare the USB port for other devices. My question: Is there an adapter or cable to use the Seagate Firewire 800 with my Firewire 400 port? I don't know, where and what to look for.
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There are many adaptors, try here

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I have a Power Mac G4 (2004) and want to transfer all my files to a new MacBook Pro 15.4". Can this be done thru firewire cable or do I have to transfer to an external Firewire 800 hard drive first?

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Any advice to this ignorant question would be appreciated.
Thanks,
Paul

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http://discussions.apple.com/thread.jspa?threadID=435350&tstart=0

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Hello all,
does anyone know whether it is possible to connect a firewire 800 device (e.g. external Hard Disk) to a firewire 400 port on a e.g. MacBook?
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Cheers,
Gillion

Hi Gillion!
Welcome to Apple Discussions.
My understanding is that with the appropriate cable you can connect a FireWire 800 to a FireWire 400 device and vice-versa.
http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wa/RSLID?mco=4B8 F4B38&nplm=TP320LL/A
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Hi rrlavigne,
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Macally firewire 400 external HD - Duplicated connection id.

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Hi-
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This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.
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