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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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:
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.
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