Public bug reported: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Tags: 3.0 kernel speed ubuntu usb -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1242085 Title: Low write speed to USB disks - do something! Status in “linux” package in Ubuntu: Incomplete 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1242085/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp