Every time when I copy large files from my laptop to any pen drive (USB) on my Ubuntu 14.04, all processes slow down. Even the mouse pointer slows and is stuck. If I open multiple tasks, many of them stop responding. The copying also stops for a long time at 100%, 0 sec remaining.

I am using Windows 8.1 alongside Ubuntu in which there is no problem in copying files.

Useful Hardware Specification of my laptop : HP Compaq 15-s103TX Notebook

  • Processor
    Processor : Intel Core i3 4005U
    Clock Speed : 1.7GHz
    Chipset : HM87
    Cache : 3MB

  • RAM: 4 GB DDR3, 1600 MHz

  • Graphic processor: NVIDIA GeForce 820M

  • Dedicated graphics memory capacity: 2GB

  • System architecture : 64-bit

  • HDD: 1TB SATA 5400 RPM

  • Number of USB 3.0 ports = 1 (same problem here)

  • Is there encryption or decryption happening? Perhaps you have an encrypted partition for Ubuntu, and that's taking extra processor time on those big data file transfers which isn't happening under Windows.
    – Marc
    Dec 26, 2015 at 21:53
  • 1
    I don't have any encrypted partitions. But I do have all the partitions (except root,home swap. which are in ext4 ) in NTFS format. This is because windows don't recognize ext 4 partitions. All my friends (10-15) who are facing the same problem have NTFS partitions. Is this a problem??
    – user441517
    Dec 27, 2015 at 5:35
  • 2
    Consider this: askubuntu.com/questions/397249/…
    – Marc
    Dec 27, 2015 at 18:31
  • @Marc, if it was slow due to decrypting files on an encrypted partition, it would be slow every time you used a file on that partition, not just when copying the file to USB.
    – Olathe
    Jan 2, 2016 at 7:35
  • lwn.net/Articles/572911
    – chexum
    Jan 2, 2016 at 9:06

1 Answer 1


Your system configuration looks good it doesn't matter, but check the number of process running and stop the process which occupies more memory.

I propose the best way to copying large files into Pen drive, is to use rsync.

rsync -r source/* destination

it is the efficient way use it.

For more information refer, have fun Bro...

  1. How do you find out which program is using too much memory?
  2. Learn About rsync.

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