I am dealing with the following problem.
Everytime i try to copy data in usb the trasnfer speed is etremely low! The same device on other machines works as it should be.
Do you have any idea on how to fix it?
Thank you in advance!
MacBook Pro (Retina, 13-inch, Mid 2014), OS X Yosemite (10.10.3)
Hi vasilisdmr,
Thank you for contributing to the Apple Support Communities.
If the transfer speed seems unusually low on your MacBook Pro when you copy files to and from a USB drive (or thumb drive), these troubleshooting tips may help:
USB and FireWire Quick Assist - Apple Support
Check the connections
If you're using a cable, make sure that both ends of the cable are properly and securely connected to your device and Mac. Try unplugging your device and then plugging it back in. If you're connecting a FireWire device, make sure that the cable is no more than 15 feet (4.5 meters) long. If you're connecting a USB device, make sure that the cable is no more than 16 feet long. If you're making a direct connection, make sure that the device's connector is fully seated in your computer's port. If your device also connects to a power outlet, make sure it has power.Check your device's power
If the device has a power switch, make sure it is on. Try turning your device off and then on again. Some devices require more power that the bus supplies. If your device came with an external power adapter, always connect it to a power source in for the best performance from your device.Restart your Mac
Sometimes a simple restart can resolve issues. From the Apple menu, choose Restart to restart your computer. Once your Mac is finished starting up, test your device again.Try a different port and cable
Connect your device to a different USB or FireWire port on your Mac. If you connected your device to a USB or FireWire hub or to a port on another USB or FireWire device that's connected to your Mac (known as daisy chaining), connect your device directly to a port on your computer. Some devices need to draw power from a USB or FireWire port to work; if you connect a device to a non-powered hub (one that isn't plugged in to a power source) or to a low-power port (such as the one on your USB keyboard), it may not work. If you have another known-good cable, try swapping the cable to see if that works. If it does, you should replace the problematic cable.
If you only use the USB device with Mac computers, you may also want to verify that it's formatted "Mac OS X Extended." This article refers to Aperture, but has good steps for formatting a drive:
Format external drives to Mac OS Extended before using with Aperture - Apple Support
Best Regards,
Jeremy
I need to copy a 5.6gb file in usb about 22 minutes. Your reply helped me a little but it did not fix the problem.. I didn't check the mac os extended journal in the past, so i will try with other usb devices too and give a feedback. Thank you for your time!
slow usb transfer speed mac osx
