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[Darek <1242085@xxxxxxxxxxxxxxxxxx>]

Disks tool shows the USB 3.0 flash drive speed. Here it is connected via USB 2.0. 
It reach the max USB 2.0 read speed but the write speed is always low.
I do not have USB 3.0 here but the result is the same on laptop Asus X55U connected directly via USB 3.0. 

** Attachment added: "Disks_tool_USB_write_speed.png"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1242085/+attachment/3883878/+files/Disks_tool_USB_write_speed.png

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https://bugs.launchpad.net/bugs/1242085

Title:
  Low write speed to USB disks - do something!

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Problem description:
  I noticed very very low write speed to USB disks, especially to the new ones with USB 3.0. The "Disks" tool shows write speed about 7 MB/s !!! After start benchmark this tool shows write speed about 17 MB/s but imidiatelly goes below 10 MB/s. Same low speed during copy e.g. 3GB file manually to USB 3.0 disk. There is no such problem with read or access speed, only write. Unbelievable !!! 

  OS: Ubuntu 13.10 (64 bit mode).
  Kernel: 3.11.0-12-generic
  Disk: Kingston DT Ultimate G3 (32GB)

  Similar low write speed problem is for disks: 
  - Seagate Expansion Portable Hard Drive 500GB (model inside ST500LT012-9WS142)
  - Verbatim Store 'n' Go SuperSpeed USB 3.0 Portable Hard Drive 500GB (model inside ST500LM0 12 HN-M500MB)

  I report this bug from PC, but the same bug is on my laptop Asus X55U. 
  Even the write speed on my laptop is more important to me.

  What I found about this bug (VERY IMPORTANT NOTE):
  - In old realese 12.04 LTS disks works OK.
  - In 13.04 disks works faster than it is now in 13.10.
  - If disk is formatted as NTFS the write speed is the lowest. 
  - If disk is formatted as EXT4 the speed is x2 better. 
  - If disk is formatted as FAT32 is low too.
  - No matter if disk is connected via USB 2.0 or USB 3.0. The low write speed is always the same. 
  - This problem doesn't exists in Windows (so this is no hardware or BIOS problem).
  - This problem doesn't exists in OpenSUSE (so this is no hardware or BIOS problem).
  - There is no such problem with read or access speed. Write only. 
  - No matter if there is UEFI. Laptop Asus X55U has UEFI but PC has not.
  - Hardware - no matter (same is on laptop ASUS X55U, I report from my PC now)
  - No matter if Ubuntu is 32 or 64 bit mode.
  --- 
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  user-pc    1424 F.... pulseaudio
   /dev/snd/controlC0:  user-pc    1424 F.... pulseaudio
  CurrentDmesg:
   [   20.325188] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
   [  167.464491] systemd-hostnamed[2044]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
   [ 1467.583396] systemd-hostnamed[2164]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
   [ 5670.978467] systemd-hostnamed[2802]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=4b9c34cd-9ce1-4ac3-ac15-3801b2fcc06b
  InstallationDate: Installed on 2013-10-18 (1 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=2f9a3d14-fd4f-4d71-87d1-05e40c87052e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill:
   
  Tags:  saucy
  Uname: Linux 3.11.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 09/23/2005
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0519
  dmi.board.name: P5WD2-Premium
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0519:bd09/23/2005:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5WD2-Premium:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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