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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** This bug is no longer a duplicate of bug 500069
   USB file transfer causes system freezes; ops take hours instead of minutes

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https://bugs.launchpad.net/bugs/392089

Title:
  Slow USB transfer for FAT32

Status in “linux” package in Ubuntu:
  Won't Fix

Bug description:
  This bug is  "spin off" of bug   "file transfers on USB disk are very
  slow "

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/197762

  I did some tests and found out that when writing to my USB flash disk
  the speed is quite low. I observed that the situation is improved (or
  rather resolved) if the flash disk is formated as ext3, so this can be
  a problem with fat32. I also have an external USB hard disk (NTFS
  formated) which seems to work in satisfactory way. This further
  supports the fact that the problem affects fat32 formatted disks.

  I ran several tests according to
  https://help.ubuntu.com/community/DiskPerformance (and also some other
  tests). In all cases I made sure that the flash disk was detected as a
  high speed device (USB 2.0) and not as a full speed device (USB 1.1)
  using the lsusb command.

  Since the problem is more obvious for very large files I let dd create
  a test file for about 5 minutes, just to be on the safe side.

  The facts:

  When I generate a load using dd for about 5 minutes the results from
  dd are:

  FAT32 USB flash disk:    1617933312 bytes (1.6 GB) copied, 305.66 s, 5.3 MB/s
  ext3 USB flash disk:       41091136 bytes (41 MB) copied, 3.85154 s, 10.7 MB/s  
  NTFS Hard disk:             4294967295 bytes (4.3 GB) copied, 290.644 s, 14.8 MB/s (maximum file size was reached in less than 5mins

  The same USB flash disk performs roughly twice as fast on a Windows XP
  machine.

  The USB flash disk specificstions state that it is able to write at
  10MB/sec and read at 15MB/sec


  The hardware
  M/B -->                   ECS GF7050VT-M5 (nvidia 7050 chipset), with the latest BIOS
  USB Flash Disk --> Crucial Gizmo! plus 4Gb (JDOH4GB-730)
  Hard Disk -->          Western Digital WD300 connected with no-name IDE-to-USB equipment.


  The sofware
  Kubuntu Jaunty 64-bit with all the latest updates installed

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