Slow USB transfer

I can't figure out how to replicate this yet, but it's happened twice today. I'm stuck and don't know what to look at next, but it's a problem.
My USB transfer speeds slowed to a crawl on a 2GB directory copied via Ranger just now, and earlier on a larger transfer. Several GB took ~2 hours over USB 2.0 from ext4 HDD to fat32 USB. The USB stick is RadioShack's GigaWare brand and shows up as Sandisk in lsusb, and never been formatted since i opened it.
Looks like ehci_hcd is loading properly for the disk. usb 8-2 is my mouse. Got a USB fan plugged in (one 5V one), too.
I haven't modified the udev rules and usually let udiskie mount things.
dmesg | grep usb
[304447.009631] usb 1-3: reset high speed USB device number 2 using ehci_hcd
[304447.239650] usb 8-2: reset full speed USB device number 2 using uhci_hcd
[306484.456105] usb 2-1: new high speed USB device number 7 using ehci_hcd
[306484.581252] scsi10 : usb-storage 2-1:1.0
[309421.079092] usb 2-1: USB disconnect, device number 7
[324573.564350] usb 8-2: USB disconnect, device number 2
[372694.409521] usb 8-2: new full speed USB device number 3 using uhci_hcd
[372694.576607] input: Microsoft Microsoft® Nano Transceiver v2.0 as /devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0/input/input17
[372694.576714] generic-usb 0003:045E:0745.0004: input,hidraw0: USB HID v1.11 Keyboard [Microsoft Microsoft® Nano Transceiver v2.0] on usb-0000:00:1d.2-2/input0
[snip]
[496984.930431] usb 2-1: new high speed USB device number 8 using ehci_hcd
[496985.056227] scsi11 : usb-storage 2-1:1.0
[498636.454057] usb 2-1: USB disconnect, device number 8
[499099.880160] usb 2-1: new high speed USB device number 9 using ehci_hcd
[499100.005128] scsi12 : usb-storage 2-1:1.0
[499953.395984] usb 2-1: USB disconnect, device number 9
[659242.307482] usb 2-2: new high speed USB device number 10 using ehci_hcd
[659242.786728] usbcore: registered new interface driver usblp
[661547.446152] usb 2-2: USB disconnect, device number 10
[681909.354822] usb usb3: root hub lost power or was reset
[681909.354862] usb usb4: root hub lost power or was reset
[681909.354902] usb usb5: root hub lost power or was reset
[681909.355014] usb usb6: root hub lost power or was reset
[681909.355053] usb usb7: root hub lost power or was reset
[681909.355091] usb usb8: root hub lost power or was reset
[681909.595249] usb 1-3: reset high speed USB device number 2 using ehci_hcd
[681909.825233] usb 8-2: reset full speed USB device number 4 using uhci_hcd
[788645.857480] usb usb3: root hub lost power or was reset
[788645.857521] usb usb4: root hub lost power or was reset
[788645.857560] usb usb5: root hub lost power or was reset
[788645.857806] usb usb6: root hub lost power or was reset
[788645.857861] usb usb7: root hub lost power or was reset
[788645.857901] usb usb8: root hub lost power or was reset
[788646.097878] usb 1-3: reset high speed USB device number 2 using ehci_hcd
[788646.327888] usb 8-2: reset full speed USB device number 4 using uhci_hcd
[1043552.825767] usb 2-3: new high speed USB device number 11 using ehci_hcd
[1043552.951568] scsi13 : usb-storage 2-3:1.0
[1069442.865548] usb 2-3: USB disconnect, device number 11 # Disk unmounted with udiskie via pcmanfm and physically removed
[1069585.269848] usb 2-3: new high speed USB device number 12 using ehci_hcd # Disk reinserted and mounted
[1069585.394806] scsi14 : usb-storage 2-3:1.0 # Transfer speeds are normal again
I'm not sure where to look next to try to diagnose. There's a bug report that may describe this but i'm out of my depth here.
On edit I'm assuming those power lost/reset events are suspends but not sure.
Last edited by nathan28 (2011-08-24 03:19:46)

First of all, what I'm about to say may be close to worthless... but that never stopped me before
But this caught my eye:
Looks like ehci_hcd is loading properly for the disk. usb 8-2 is my mouse. Got a USB fan plugged in (one 5V one), too.
combined with this:
[788645.857480] usb usb3: root hub lost power or was reset
[788645.857521] usb usb4: root hub lost power or was reset
[788645.857560] usb usb5: root hub lost power or was reset
[788645.857806] usb usb6: root hub lost power or was reset
[788645.857861] usb usb7: root hub lost power or was reset
[788645.857901] usb usb8: root hub lost power or was reset
I have a nettop powered by one of those little 90W "brick" power supplies and if I plug my Hauppage USB TV adapter into the sucker it draws so much power that all hell breaks loose on the system. I can't tell how badly though because the USB keyboard goes dead.
A powered USB hub fixed that issue.
But again, I have no idea if this is even remotely related to your errors.
Another thing (since I'm on a roll with bad advice)... I've got some USB flash drives that are simply dog slow... they just are. Put a different brand into the same slot and do the same operations and the difference is amazing. Plus, you don't mention the size of the USB flash drive, but they are known to get slower on writes the closer they are to being full... that's just how they roll.

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Extremely slow usb transfer/copy

My Macbook Air 13" medio 2011 copies extremely slow to usb.
I made a benchmark and got the following results:
System Info
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When I bought the computer the usb transfer speed, was fast, but have become very slow over time.
I've tried to do a clean install of OSX but it has not helped

This is a know issue for last 2 years and there has been no response from Apple. I guess its time to ditch mac and install Ubuntu.

Slow USB transfer to Time Capsule

I recently purchased a Time Capsule and have decided in addition to its Time Machine back-up duties to use it to store my iTunes Media, which I had previously had on an external USB HDD (and then use the external USB to back-up Media drive through a folder-syncing app, since Time Machine won't recognise a networked drive). I've connected the USB drive to the TC, and attempted to drag and drop the iTunes Media folder from the external USB to to TC HD.
The estimated time for completion was 7 days for 300GB of data.
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I'm working with a 2TB Time Capsule, 15" ealry 2011 MacBook Pro (8GB RAM, 250GB SSD), OS X Lion and a 1TB USB HDD

Please tell me that the TC isn't sending the data over wireless from the USB disk to my MacBook Pro in order to then send it back over wireless to the TC to write it to that disk!
Exactly what is happening.. sorry about that chief!! (Maxwell Smart voice).
Unfortunately if you have the external drive connected to the TC and want to write the data to the TC that is what happens.. there is no way it can directly copy since the copy is running from the laptop.
Much better to plug the external drive straight into the laptop.. and plug the laptop into the TC by ethernet cable and do the copy in one shot.. then you can do other backups (your normal incremental time machine) by wireless.
Alway try and eliminate double hop wireless.. it is incredibly slow due to having single channel half duplex operation.
Even if you have to use a separate device to do it.. the speed will be much better.
And it is better to use a usb plugged into the TC just as a backup of the TC.. use the TC itself to store your itunes rather than a drive hanging off it.

N95 8GB SUPER SLOW USB TRANSFER PROBLEM

can someone please tell me why it takes 2 hours to transfer 654 mp3s onto my N95 8GB via USB and it only takes 6 minutes to transfer the same songs onto my iPod nano 8GB
N95 8GB transfer time: 2 hours
iPod nano transfer time: 6 minutes
something is not quite right

I have the same problem with both my N95 8GB's, one has v20.0.0.16 and the other the original v15.something. Both were reasonably fast to start with, but something has changed that made them both slow. I've tried at least 4 different pc's and I've tried upgrading the fw on the one phone but nothing helps.
For example: one day I started making a backup of the phone at 8:30AM, including mass memory, at 4:30PM when I wanted to go home, it had come up to 9%! i.e. content copier is totally useless for a backup this way; I need my phone with me, I can not keep it hooked up to my pc for that long a time just to make a backup... In fact the battery will run empty before the backup finishes.
Another example is trying to get photo's off of the phone using windows' digital camera feature. It times out trying to connect to the camera after something like half an hour it has not found even 1 photo.
If anyone has got a solution, please share it.

Slow USB transfer speed when iTunes is running

hello everyone,
today I was trying to transfer a bunch bunch of files from my NAS to a portable USB 3 hard drive.
the transfer speed was 18 to 20 mbytes/s... quite slow for this device.
after investigation the problem was found that when iTunes (11.0.1) is NOT running the tranfer speed goes up to 90+ mbytes/s
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The only testing that could be performed prior to resetting the AirPort would be to make throughput performance measurements ... but, at best, these would only stand to confirm the slow transfer speeds that you are seeing.
However, if you do want to make some quantitative measurements, one easy to use (& free) utility is: AJA System Test.

Super slow usb transfers on non-unibody mac book pro after sl upgrade

Anyone other experienced the slow usb transfer speeds on thier non unibody macbook pro (late 2008) after updating to snow leopard.
I have done some testing using a sandisk cruzer 16gb on my non unibody macbook pro and there are transfer speeds super slow on the other hand with the exactly the same usb drive on my unibody I get the transfer speeds I expect.
Is there anything to do? I've tried SMC & PRAM resets without any difference.
Best,
Max

Start up in Safe Mode. http://support.apple.com/kb/PH18760
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
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Repair Disk
Steps 1 through 7
http://support.apple.com/kb/PH5836
Upgrading RAM to 8GB will help.
Best.

2 Questions:Canon7D direct USB transfer to ipad AND CF cardreader comp....

I have a new 7D on order and am wondering if I won't have quite as easy of a time getting images onto the ipad as I do now with my T1i. I read in a review on DPreview that the 7D is not setup as a direct transfer protocol and instead has to install something onto the host computer (which would obviously not work on an iPad) in order to use a USB cable to transfer directly.
Has anyone tried to direct USB transfer from the 7D to the USB Camera Connection kit? Does it work?
And secondly, is there a list of compatible USB CF card readers that will work with the USB CCK? As I believe I will need to buy one if the direct cable doesn't work. So far the two that I own don't work and say they require too much power.
Thanks for any help.
Message was edited by: arbitrage

My 7D transfers just fine to the i-pad, and very quickly mind you! It's surprising, normally hooking a camera direct to a computer and transferring is much slower than using a card reader, not so with the i-pad. I tried it both ways, card reader, and direct connect and the speed was almost identical. Also, my higher speed cards didn't seem to want to work, once I put the cards back in the camera and direct connected, they went right over.
Jo

Usb transfer rate problem with bootcamp

hello
drivers for uEye cameras are only available for windows platforms. so i am running windows xp on the latest mac mini with the latest bootcamp drivers in order to use the camera.
everything works great until i plug in another usb device. the transfer rate of the camera decreases dramatic (1/2). the second usb device is an usb hub with a microcontroller. it consumes only low transfer rates.
this constellation works perfect on other pcs. i can't compare it on os x because no drivers for the camera are available.
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greetings
michael

are there known issues with usb transfer rates on
intel mac minis? firewire cameras and harddrives
should suffer similar problems.
Welcome to Apple Discussions!
To address this specific point - no, there are no known issues with USB transfer rates that are common to Macs but not PCs. The weakness of the USB standard is that it is controlled by the host system rather than a dedicated controller, thus transfer rates (on both Mac and PC platforms) are determined by what the system is doing overall. As a result, transfer rates vary quite dramatically. Firewire, on the other hand, has a dedicated controller which ensures that a consistent data rate is achieved, almost regardless of other system activity. That's why you will often see it recommended that FW is used for external drives rather than USB, since while USB will generally provide better burst rates of data transfer, FW will generally provide far better sustained data rates, despite being theoretically slower.
In your situation, I can't help but wonder if the hub you mention is not causing the system some issues. It would not have to be a matter of it causing any significant data transfer itself, but could be the result of the hub's controller forcing the system into activity which then suppresses potential performance from the camera.
One thing is sure: if the camera works well without the hub connected, but degrades in performance with it, the issue is not with the system or the camera, but the hub.

Clean Install G4 Dual 1 GHz-Not enough Disk Space Error? -SLOW USB copies

HELP puhleeeeze!
This seems to be an issue on various sites with no one being able to figure out what is the cause and a solution. One person stated his problem went away with a fullwipe and clean-reinstall of everything. But this is what I did already.
What is the reason for the "Not Enough Disk Space" error message when both my hard drives have gigs of space available. If I had hair I'd be pulling it out by now! When trying to copy a file to my 2 internal hard drives that have a lot of space available, but only by the USB port?!!
I have a Power Mac G4 Mirrored Door (MDD) Dual 1 GHz with a clean install of 10.5.8 from the Original Mac OS X Leopard DVD. Both internal hard drives are 60GB and 100GB. The hard drives were wiped clean with Disc Utilities and reformatted to Mac OS Extended (Journaled). The Power Mac only has the OS and a few music apps installed. Easily over 30 GB of space left on the the main G4 interal hard drive and about 75 GB on the other internal hard drive.
The error seems to only happen when I connect a USB flash drive to the USB port. I tried to copy a 50MB update to the desktop-"Not Enough Disk Space" error message happened.
I know that the G4 MDD Power Macs only have USB 1.0. Is this a USB 2.0 issue? Another issue is that it has very slow USB speed (dramtically slower than normal USB 1.0 copying of files. And this is only when it is successful. Is it a USB format issue? I know I couldn't get an external USB 2.0 drive to mount on the Power Mac at all. Disc Utilities could see it but it still would not mount. I have a friend who has an older G4 single processor Mac that doesn't experience these issues with its USB 1.0 ports.
Now here's the kicker:
If I put in a CD disc in the DVD/RW drive, it copies with no problems to either hard drive. If I connect to the Power Mac via the ethernet network, files can copy with no problems. But any USB connection - I get a the "Not Enough Disk Space" error message. I know this is an old mac... but it's never been problematic until this latest wipe and update to Leopard 10.5.8.
Is there a solution to this? Any and all help, feedback, comments, thoughts are greatly appreciated in advance!!!

Hello everyone,
Ok, I did the ultimate task. I erased the hard drives, AGAIN. Just to start fresh from scratch. Hard drives were erased. Did a new install of Mac OS 10.5. And all was well. I could copy with no problems. I gave the computer to my friend and all was good for a couple of days and then the issue came back again. He couldn't copy anything to his internal hard drives and we received the "Not enough disk space" error message! I was baffled. A complete hard drive erase 2 times, 2 fresh Mac OS 10.5 installs and it works for a few days and then coping to HD we got the same **** problem again! THEN - I remembered that the PRAM battery was dead on this G4 Mirrored-Door Dual 1GHz PowerMac. I had recommended that he get a new battery, because this computer would always have the incorrect date and time after every restart. So with recalling this, I had him reset the PRAM by holding down the CMD+OPT+P+R keys after a restart (start-up Chime). I had him hold the keys for at least 3 start-up-chimes. Soon as the G4 Power Mac started up everything was fine again. He was able to copy files to his hard drives again with the "Not enough disk space" error message.
So everyone! Try zapping your PRAM (resetting the PRAM) and see if this solves your problem. I told my friend to get a new PRAM battery to replace the old one that is completely dead. I have not heard back from him. I will ask him again if the problem has come back.
If that fails: My only other solution would be to consider that it is possible that Mac OS 10.5 has a conflict or issue with the G4 Processors and maybe it is safer to install Mac OS 10.3 or 10.4. Because this problem only has occured after installing Mac OS 10.5, the highest version of the Mac OS the Dual 1GHz Mirrored-Door G4 can be installed.
Cheers,
B

Windows Server 2008 R2 Slow LAN Transfer (Receive)

Using Windows 7 Ultimate and Windows Server 2008 R2
Two machines, connected via 1GB 1000base-T LAN, with a 1Gb switch between... and yes, I've tried swapping cables and ports. Server has two RAID5's, a 6 platter and an 8 platter. Workstation has two RAID5's, a 3 SSD and a 4 platter. Both sides using Intel
CPU's and a RealTek 8100C chipset Gb LAN, same LAN drivers.
Using Windows Explorer to COPY a 20GB file:
Server Disk1 to Server Disk 2: >250MB/s (Server disk I/O isn't an issue).
Server Disk2 to Server Disk 1: >250MB/s (Server disk I/O isn't an issue).
Workstation Disk1 to Disk2: >150MB/s (Workstation disk I/O isn't an issue).
Workstation Disk2 to Disk1: >150MB/s (Workstation disk I/O isn't an issue).
Server Disk1 to Workstation Disk2: 91MB/s (near 100% LAN utilization).
All looks good so far:
Workstation Disk2 to Server Disk2: 25MB/s declining to 17MB/s; occasionally as low as 9MB/s.
Some of the changes listed above appeared to work for a few moments. I've seen as high as 90MB/s for a few seconds, but it declines rapidly under 30MB/s... so no fix that has lasted.
It appears there is something in Windows 7 that prevents fast transmits; or something in Windows Server 2008 that blocks fast receives. I have set the server-side receive training to disabled, normal, highlyrestricted, and experimental and the Win7 side
to off, normal, and highlyrestricted in various combinations. Again, nothing concrete to report as an improvement.
What would the MS Gurus suggest I do with NetMonitor as far as capturing something worth their time to diagnose?

I've tried disabling auto tuning on the clients with no appreciable effect. The throttling feature however appears to have had an effect - changing the setting from default 10 to 70 has slowed the transfer from 20MB/s down to about an initial 6MB/s that
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Question: What does the 10 (0x0a and 70 (0x46) represent: Mbps on the LAN, or 10% and 70% reserved, or?
I'll try the "off" setting of all FF's and add to this.
In any case, having a backup server that can't be utilized due to client "entertainment media" issues is a little painful... there should be a straightforward and published method to set the network to "normal".
UPDATE:
I've tried settings of 0, 10, 70, and FFFFFFFF. 10 might have been best, but only marginally better than 70. Range of time to copy was under 7 minutes to over 8 minutes. Very small difference.
But I also tried this using Windows Explorer and a Dataset of one folder containing 12.5GB of miscellaneous folders and files - and was surprised.
- Dataset is at \\WIN7\Dx\ = = Client physical RAID5 drive D:\Dataset
On WIN7 Client: Share drive D with Everyone as Dx
On WSvr Server: Share drive D with Everyone as Dx
On WIN7 Client: Map \\WSvr\Dx to Z:
On WSvr Server: Map \\WIN7\Dx to Z:
On WIN7 Client, using Windows Explorer:
-- Copy Dataset from Local Drive D: to Network Drive Z:
-- Took about 8 minutes, with 20% network utilization.
On WSvr (2008 R2 Server), using Windows Explorer:
-- Copy Dataset from Network Drive Z: to Local Drive D:
-- Took about 3 minutes, and 70% network utilization.
Why does running the copy from the server allow better network utilization and net throughput?
UPDATE2:
I am NOT using HOMEGROUP; I have a dedicated workgroup network the client is a member of, and the server is a DC. I'll eventually try joining the client to the domain and see if that changes anything, but doubt it will so haven't taken the time yet.

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Anyways, I tried to do a CCC image on my MacBook Pro Retina 2014 with Yosemite and this is what I found out:
1). USB 3.0
Very, very slow. I cannot get more than 40 MB Read / Write. Tested with major flash drive proven to have high speed:
256 GB PNY USB 3.0 Turbo Flash Drive (4.5 stars - 1200 reviews in Amazon).
64 GB SanDisk UltraFit USB 3.0 (4 stars - 200 reviews)
From the Amazon URL above, you'll see that other reviewers (see the Amazon URL) got 180 MBps Read and 80 Mbps Write, but I don't know if they are running Yosemite and/or the new MBPr.
From the System Report, Yosemite show that these drives IS capable of USB 3.0 speed:
USB 3.0 FD:
Speed: Up to 5 Gb/sec
Manufacturer: PNY Technologies
Location ID: 0x15200000 / 12
Current Available (mA): 900
Current Required (mA): 504
Capacity: 256 GB (255,999,344,640 bytes)
Removable Media: Yes
Internal Memory Card Reader:
Product ID: 0x8406
Vendor ID: 0x05ac (Apple Inc.)
Version: 8.20 Serial Number: 000000000820
Speed: Up to 5 Gb/sec
Manufacturer: Apple
And this brings me to the next problem...
2). Cloning
I can clone my new MBP with Yosemite as usual, but then booting up from the flash drive is SUPER SLOW, like this:
Apple icon shown with progress bar --> 10 minutes
Login screen shown - click on the Password box --> beachball for 5 minutes
Got to desktop --> beachball for 5 minutes
... you got the idea
With Maverick, all the cloned image boot up fast and is usable, as if I the image is installed in the internal hard drive. I tried both SuperDuper and Carbon Copy Cloner - same exact results.
So my questions:
1). Is the slow USB 3.0 speed a common problem or my MBP just have bad ports (both of them?)?
2). Any idea about the cloning issue? I am leaning towards Yosemite OS as the main culprint, since Maverick works OK, but want to get the expert opinion.

FYI, this is the speed I get for one of the USB drive (see below). This is far below the speed I get on Windows machine or, as other posted in Amazon review, in older MacBook.
Keep in mind that these tests are done using two separate USB 3.0 flash drives, both reported to have speed of 5Gb/Sec in OSX System Report (See Apple FAQ here - How can I determine if my device is connected as a USB 3 device?) and are fast in Windows machine.
Anyone see the same problem with USB 3.0 on latest MacBook Pro?

What is the best way to make a 30 minute video lecture taken with my iPad available to my university class? Email and USB transfer do not seem to have the capacity. Thanks!

What is the best way to make a 30 minute video lecture taken with my iPad available to my university class? Email and USB transfer to the PC in the classroom do not seem to work because of the file size. Thanks! Quincy

How to Transfer Photos from an iPad to a Computer
http://www.wikihow.com/Transfer-Photos-from-an-iPad-to-a-Computer
Importing Personal Photos and videos from your iOS device to your computer.
http://support.apple.com/kb/HT4083
 Cheers, Tom

USB transfer modes

Could any one tell me about the USB transfer modes in X5-01. When I am in PC suite mode, is it safe to copy and paste files to my memory card?. I asked this because one of the songs I copied to my SD card stopped playing at a particular point and then I restarted the phone and now that song is playing completely fine. For some troubleshooting purpose I formatted my mem card and *#7370* my phone for a total reset and started copying all the music files again to SD card in PC suite mode. I disconnected phone from PC and opened the gallery. The gallery is now starting for the first time and displayed a message "Repairing corrupt media Library" and it added all the files. Why the media files are corrupted. Is that because I pasted the songs directly to the mem card in PC suite mode other than the Mass Storage mode?. What is the significance of Mass Storage mode.

If I was putting music on a memory card , I'd incert card in PC load up all the music an simply replace in phone ! May hep reading these also !
/t5/Nseries-and-S60-Smartphones/Can-t-refresh-N97-music-library/ta-p/948327
/t5/Nseries-and-S60-Smartphones/Album-art-in-Music-Player/ta-p/948321
Good Luck
If I have helped at all, a click on the White Star is always appreciated :
you can also help others by marking 'accept as solution'

USB transfer hangs, Finder freezes - cannot relaunch Finder

Is there a way to FORCE a relaunch of the Finder when it hangs during a USB transfer (to a mobile phone) ?
I use Relaunch Finder, Actitivity Monitor, etc, to no avail. The Finder will not re-launch.
Everything else works (such as this Safari use of Apple Forums).
Restarting the Mac is a drag.

Eric,
I really thank you for your quick response. Before I try that, I need to explain something I just did- My time machine backup external hard drive is actually a guardian maximus 2 slot raid 1 setup to mirror so I have 2 disks. Before I do anything to reset time machine, I took that Guardian Maximus and tried to connect direct to my computer to read it. It would not recognize it. then I took out BOTH hard drives and tried to read them individually. Disk Utility said BOTH needed repair. The odd thing is that the Guardian lights did not turn red on either one- both lights green. Which is what its supposed to do. Any suggestions based on this information?
I really do appreciate all you in the forum provide.
Skip

Slow file transfer - ethernet + firewire issue?

Here's the setup -
Win98PC > ethernet (direct cable connection) > iMac G5 > Lacie d2 FW drive
Connection (100BaseT) works, logins work fine, browsing folders & files is fine. But when I transfer files from the WinPC to the Lacie drive through the iMac G5 it is unbelievably slow. Same thing if I use one of my other Macs in place of the WinPC, so it looks like a network or iMacG5 issue, not a WinPC issue.
On the other hand, if I use Airport to connect a WinPC, eMac or MacBook to the iMacG5, the file transfers are blindingly fast.
Is this perhaps because the FW & ethernet controllers in the iMac G5 are the same PHY chip? Is this some kind of contention for bandwidth through the PHY chip? (The Airport card in the iMacG5 is on a separate bus, not connected to the Ethernet/FW PHY chip, which makes me suspect something is up with the ethernet/FW controller.)
Anyone else encounter a problem like this with slow file transfer through your iMacG5 to an external FW drive?

Martin, that's really interesting. I've noticed slow network transfers in the past but always racked it up to overhead and parity errors inherent in the OS's. Never thought it might be the PHY chip, though it certainly could be. Apple has a broadband tuner which might help you by increasing packet size (but you probably knew that as a Level3). My stopgap is to do the file transfers with firewire, but your laptop may not have that option.
You could maybe copy to the mac over the network, then copy a second time to the LaCie. Not elegant or clean, but will save you time. Kinda like taking the backroads to avoid rush hour traffic - it's farther to go but you get there faster.
I'll look into the controller question. Let us know how you're doing,
Ed

Slow USB transfer

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