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
anyone has an idea on how to solve the problem?

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.

Similar Messages

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
Xbench Version
1.3
System Version
10.8.3 (12D78)
Physical RAM
4096 MB
Model
MacBookAir4,2
Drive Type
SanDisk Cruzer Blade
Disk Test
5.64
Sequential
7.54
Uncached Write
4.39
2.69 MB/sec [4K blocks]
Uncached Write
4.61
2.61 MB/sec [256K blocks]
Uncached Read
16.21
4.74 MB/sec [4K blocks]
Uncached Read
41.74
20.98 MB/sec [256K blocks]
Random
4.50
Uncached Write
13.94
1.48 MB/sec [4K blocks]
Uncached Write
1.24
0.40 MB/sec [256K blocks]
Uncached Read
553.36
3.92 MB/sec [4K blocks]
Uncached Read
109.49
20.32 MB/sec [256K blocks]
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

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.

Slow write transfer speed on shared xsan folder - osx 10.8.3

XSAN3 - OS X 10.8.3
I am getting slow transfer speeds when saving to a shared xsan folder using the smb protocol.
Writes are about 15 MB/s. Reads are about 85 MB/s.
Some transfers to the shared xsan folder will fail and it doesn't matter if I am reading or writing.
If I share a folder from the system drive, the speeds are much higher and I do not have any transfer failures.
Writes are about 76 MB/s. Reads are about 99 MB/s.
If I transfer files using the file server I am sharing from, I get write speeds close to 90 MB/s to the xsan volume.
Using the AJA Test Tool:
Maximum write speeds to the xsan volume are about 600 MB/s
Maximum read speeds from the xsan volume are bout 700 MB/s
The file server and metadata controllers are Mac Pro 5.1 Mid 2012.
Xsan Storage is the Vtrak EX30.
It is configured according to documentation supplied by apple and promise.
All Xsan clients are dual nic with nic 1 configured for public and nic 2 configured for the private.
I have checked the XSAN admin tool and all metadata IPs appear correct for all clients,
thery are all using the private IP.

What template did you use for the creation of the SAN? Recall, if you did a video template but you are transferring generic office files, your performance will suffer. This is due to the block allocation size calculations. The SAN may be tailored for specific types of writes. If you are doing something outside of the expectation, you may experience negative performance.

Slow file transfer speed on OS X / Windows LAN

I have a Mac Mini with OS X Server (Yosemite) on a network of 5 Windows 7 PCs, the server hosts FileMaker Server 13 and also some files in a shared folder.
I notice the file transfer speed when copying a file from one PC up to the server's shared folder is around 350KB/second, is this an acceptable speed? how could I improve it?
Thanks for your help.

I'm having the same issues.. I recorded a bunch of video with the 4s.. now i'm copying them to my windows 7 pc with it peaking out at 900KB/sec. My corsair thumb drive in the same port gets 5-10x this speed. any luck getting faster speeds?

Screensaver not starting when iTunes is running. Works otherwise...

Hi everyone,
My screensaver will not start when iTunes is running (also Spotify). When the app is closed, the screensaver starts when it's supposed to (5 min. in my case, but have tried other time limits). I've tried changing mouse settings and even shutting it off to see if that's the cause but it didn't help. I use the MacMini as a home theater computer hooked up to my plasma so I need the screensaver to work. In the meantime, I've been using hot corners to force screensaver, but I would love for it to start automatically when music is playing. I've tried rebooting, resetting, but to no avail.
Has anyone else had this issue or know what the problem is?
I'm running MacMini brand new. Mavericks 10.9.1. Latest iTunes.
Thanks.

I don't normally use the screensaver. However when I tested it, I get the same results while iTunes is running.
I encourage you to report it using > Apple - Mac OS X - Feedback

USB transfer speed checker

In windows 7 it's quite easy to see the transfer speed of say a USB drive, but I've been trying to search up some sort of app or widget that can tell you how fast the USB transfer speed is, just to gauge the performance. I know there is xbench but that's just read/write speeds. Thanks.
Message was edited by: Nanotechnology

In windows 7 it's quite easy to see the transfer speed of say a USB drive, but I've been trying to search up some sort of app or widget that can tell you how fast the USB transfer speed is, just to gauge the performance. I know there is xbench but that's just read/write speeds. Thanks.
Message was edited by: Nanotechnology

Palm Pre USB transfer speeds?

This is something I've had a problem with since launch, but I don't transfer much so it's not THAT big a deal. Still very annoying and frustrating though.
It seems anywhere from XP to Windows 7, both Palm's cable and my own, I get ~2MB/s writing to the Pre. My brother's is the same way. I've tried various different caching options for removable devices, along w/ optimizing for speed (and thus needing proper ejecting) but nothing seems to help. All the caching did was boost what looked like an initial speed bump, but it all caught up at the end.
When itunes sync worked, that was painfully slow too compared to even my old 1G iPod mini. What gives? Did palm cheap out on it, or were these early devices flukes?
Post relates to: Pre p100eww (Sprint)

I just tested mine as well. Writes at around 2-3MB/s, reads around 18MB/s . Not sure if its just a hardware limit or not. It has not been a huge deal for me though. I have transfered 500-700MB movies over to it and till now did not even pay attention to the transfer speed. Usually just walk away when I do it.

USB Transfer Speed

I knkow in windows explorer in windows 7 if you click "more details" you can see the transfer rate (Ex: for USB Drive). Is there an app or addon to the finder that can do the same (tell me how fast the file is being transferred)?

I also am experiencing extremely SLOW transfer speeds of files between an external harddrive and my T61.
The details:
External HD: SimpleTech Model 96300-41001-073
OS: Windows 7 x64
Memory: 4GB
Current transfer speed ~8.80 KB/s
Machine is setup dual boot. When switched to Windows XP Pro x86....the slow speeds are not experienced.
Copying to/from a USB thumb drive is not experiencing slow speeds.
Find no useful information on SimpleTech website. Have made two requests for help from SimpleTech with no response.
Lenovo site does not list this explicit problem. However a similar problem was noted. It's fix was made available in a BIOS update which I applied. The BIOS update did not correct my problem. (re: http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-67989)
All relevant (as I could determine) fixes listed for the beta of WIN7 Beta have also been appplied. I find no updates for WIN7 RC.
How to further diagnose?
Fix to apply?

Mavericks USB transfer speeds

Is it just me or did Apple seriously kick down the maximum transfer rates on usb devices. Literally feel like i'm using USB 1.0 in the year 2000 when transfering ANYTHING! Cloud promotions?

I was noticing the same issue on my iMac, late 2009 with USB 2.0 ports running Mavericks 10.9.2. The transfer speed was way below what it should be. I ran some tests to collect data. From what I recall I was getting about 7MB/s rate compared to the USB 2.0 stated rate of 48MB/s. I don't expect to hit close to the stated rate however being that it was only 14% of the stated rate seemed a bit too low. I called Apple and the support was great but after a few attempted resets, configuration changes, etc..the issue was not solved. The person finally came back stating that after discussing with their engineering team, this is a known issue and will be fixed in the 10.9.3 update for Mavericks. I transferred a file of about 500MB and timed it. I would expect some error in the timing but the transfer rate consistently was hovering about 12-16% of the stated USB 2.0 rate. I am going to wait and see what 10.9.3 does. May I ask what rates were you seeing?
This little test also had me suspect other areas including ethernet and wi-fi. Over ethernet to my time capsule (n) I got a rate of about 25MB/s, which is about 19% of the stated gigabit etherent. The test over wi-fi to my time capsule resulted in about 9MB/s, which is about 23% of the stated rate for Wireless N.

ITunes crashes when I connect my iPod to the PC when iTunes is running....

I have written about this problem before, but there have not been any successful solutions as of this date. I will explain my situation a little further and maybe someone can help.
Most of the time, when I connect my iPod to my pc while iTunes is running, the instance the iPod shows up on the library site, and whenever I move the cursor, iTunes crashes, so I have to close iTunes right away and try to disconnect my iPod. Most of the time, a message comes up that says info is being transferred to the ipod and that I shouldn't disconnet it at that time, but I usually go ahead because I know it isn't transferring at that time, since itunes has crashed.
Sometimes, after I have clicked on the first message to go ahead and disconnect my ipod, another messages comes up that says something to the effect of, "You can't disconnect because it is being used by another server at this time." So I click "OK" and then iTunes stays on for a few moments which gives me time to transfer a song or two, but then itunes crashes as soon as it finished transferring or before it finishes.
As anyone can imagine, this has really become a hugh problem. Having an iPod and not being able to use iTunes makes it very unhandy. I'm not able to add any new music or any of the playlists which i have been working on. Does anyone have a solution, or any suggestions as to what may be going on? It would be deeply appreciated.
I plan to restore my iPod in a day or two if I don't get a solution to this, but I don't have all of the music, videos, etc. that I have on the iPod since I removed much of it from iTunes to help the computer run faster. I had over 2000 items in the library, so it was pulling the pc down and it was taking forever to use the computer.
I am unable to use any of the software to transfer everything from my iPod to the iTunes library because of the problem with iTunes crashing when I connect the iPod, so this isn't a solution at this time.
Someone, please help!
HP Windows XP Using DSL for internet access

I suspect a hardware problem. But do the following to rule out a software problem:
- Reset. Nothing will be lost.
Reset iPod touch: Press and hold the On/Off Sleep/Wake button and the Home
button at the same time for at least ten seconds, until the Apple logo appears.
- Restore the iPod from backup via iTunes
- Resore the iPid to factoery defaults/new iPod.
In the latter part of you post, I thin you ar sayng that you do not have a syning computer and the music is not on the computer. If so, do the following so you will not lose anthing (or very little) when you restore.
- Transfer iTunes purchases to the computer:
iTunes Store: Transferring purchases from your iPhone, iPad, or iPod to a computer
- Transfer other music by using a third-party program like one of those discussed here:
Best iPod to PC
- Connect the iPod to the computer and right click on the iPod under Devices in iTunes and select Backup. This will make a backup so you can restore to the backup

Slow fileshare transfer speeds with Lion Server

I'm running Lion Server on a Mac Mini and using SMB to share files between the server and both Windows and Mac machines. I can't figure out why I can only get 2 Mb/s transfer speeds between the server and the other machines. I'm quite certain I'm not limited by my network and the disk write speeds clearly exceed 2 Mb/s. Any suggestions for boosting this speed or is this an actual limit of SMB or Lion Server?

Have a similar issue on a Macbook Pro mi 2010 : since the 10.7.3 update, Samba file sharing (to access a FreeBsd server over the LAN) is extremely slow. I mean I can't work normally since the update (3 weeks).
I've reported the bug to Apple. I think it is a bug limited to some machine version (because other mac in the office do not have the issue)

File transfer speed when on battery power

Hey there - I've noticed that my file transfer speed is ridiculously slow when i'm not plugged in to a power source. Even when my battery is fully charged it's super slow. This happens not only when I'm uploading files from a memory card to my computer but when I'm attaching files to an email, or even sending an email. I've asked other mac users and they say this is not the norm for their machines....any ideas?
thanks!
Sunny

additionally, you can disable power menagement for your wireless card completely through iwconfig's power option. I suggest you read the manpage for iwconfig, I have quotes the 2 related options for you.
txpower
For cards supporting multiple transmit powers, sets the transmit power in dBm. If W is the power in Watt, the power in dBm is P = 30 + 10.log(W). If the value is postfixed by mW, it will be automatically converted to dBm.
In addition, on and off enable and disable the radio, and auto and fixed enable and disable power control (if those features are available).
Examples :
iwconfig eth0 txpower 15
iwconfig eth0 txpower 30mW
iwconfig eth0 txpower auto
iwconfig eth0 txpower off
power
Used to manipulate power management scheme parameters and mode.
To set the period between wake ups, enter period 'value'. To set the timeout before going back to sleep, enter timeout 'value'. You can also add the min and max modifiers. By default, those values are in seconds, append the suffix m or u to specify values in milliseconds or microseconds. Sometimes, those values are without units (number of beacon periods, dwell or similar).
off and on disable and reenable power management. Finally, you may set the power management mode to all (receive all packets), unicast (receive unicast packets only, discard multicast and broadcast) and multicast (receive multicast and broadcast only, discard unicast packets).
Examples :
iwconfig eth0 power period 2
iwconfig eth0 power 500m unicast
iwconfig eth0 power timeout 300u all
iwconfig eth0 power off
iwconfig eth0 power min period 2 power max period 4
website with the current manpage:
http://linux.die.net/man/8/iwconfig
or simply:
$ man iwconfig
Last edited by stefanwilkens (2010-09-13 11:11:37)

SuperDrive slow Data Transfer Speeds

I have several home movies DVDs I would like to loadback onto my mid-2011 27" iMac but it is taking for ever to complete the transfer. One DVD disk takes 6 hours because the transfer speed is crawling. I read up onthis and info says my HL-DT-STDVDRW GA32N (FirmwareVersion KE06) is made by HLDS and they have implemented riplock which slows the data speed way down to preserve SuperDrive life expectancy anddecrease noise level. How can I disable this riplock to restore the data speed. I bought this fast/expensive machine and the SuperDrive of all things is slowing medown. Completely unacceptable.

I was having a problem ripping store bought CD's to ITunes and opened a case with Apple for suspected hardware issue. Turns out the problem was Norton AntiVirus by Symantec which was blocking my external drives. Even though the CD is internal it was killing it. Once I shut off Norton everthing started working.
The way I came to figure out it was a Software and not hardware issue was that the Superdrive worked perfectly under Windows 7 inside of VMWare Fusiion.
If you have any sort of AntiVirus, try shutting and down and using the Superdrive.
My machine is the same , late 2011 with Firmware KE06

Slower Network Transfer Speeds with .7

Since upgrading to .7, I've noticed slow transfer speeds. For example, when transferring one large file, I get 11MB/sec on average. When transferring a bunch of smaller files, I get about 1 - 1.5MB/sec. I remember is being faster in .6
This is transferring files from my Mac Pro to my Time Capsule, using Gigabit Ethernet.
Can someone let me know what speeds you are getting when transffering a large file from a Mac Pro to a TC and also a bunch of small files from a Mac Pro to a Time Capsule. (or any NAS drive)
I used Activity Monitor to test the speeds. Thanks.

Does your PC have a FireWire port? you can use IP over FireWire for better throughput than the wired ethernet.
You can't use link aggregation in this case since it requires multiple interfaces of the same type (e.g. two gigabit ethernet cards), but you cannot mix media such as AirPort and Ethernet.
The alternative would be to install a gigabit ethernet card in your PC. You'd at least then get gigabit ethernet speed between the two devices which is also a step up.

Slow USB transfer speed when iTunes is running

Similar Messages

Maybe you are looking for