Public bug reported: 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 obvious for very large files I let dd create a test file for about 5 minutes 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 claims to be 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 ** Affects: ubuntu Importance: Undecided Status: New -- Slow USB transfer for FAT32 https://bugs.launchpad.net/bugs/392089 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
