11-28-2010 06:00 AM
Have "Lenovo B450" for about 12 months. Recently connecting 2 external 2T hard drives via USB.
When I transfer files between them, using a sync program or other programs - transfer speed is very erratic. Sometimes will run at 18+MByte per second, then next transfer (did not shut down program) will quickly slow to less than 2MB/s? Performance is random?
I am running XP SP3 Professional.
The same setup (and OS) with my desktop PC gets consistently fast (18MB/s) USB transfers between the drives?
Latest lenovo drivers installed. It seems to me a BIOS problem - please test this on your B450 - Lenovo, please test.
I have tried all solutions for slow usb noted on web.
PS - my B450 is labeled as Lenovo - but may be same as Ideapad? - anyone know the difference?
11-28-2010 06:48 AM
SOLVED ! or rather a workaround was suggested by LENOVO TECH SUPPORT - a brilliant idea - Run in SAFE MODE, do the file transfers as per normal - I found the speed was consistently faster at about 25MB/s using the same sync program.
It would seem some process running in normal mode is interfering with USB file transfer speeds. Could be antivirus checking files on the fly or something else - weird **bleep** huh - Anyhoo, I will be doing big file transfers in safe mode in future. Thanks Lenovo support!
11-29-2010 08:02 PM
Thanks for sharing this with the community, and really nice to hear that our tech support was able to help you out!
As I read your question and follow up, I wondered if this might be a USB power management issue. Can you check your power management settings to see if there is an option to enable / disable power saving on USB?
If that doesn't help you, you can try to configure the various things that are being loaded at start up to narrow down what software / application could be causing this as well. Have you tried MSCONFIG from your command line? Start -> Run -> msconfig
Please keep us posted if you continue to work on this...
11-29-2010 11:04 PM
That provided solution is completely ridiculous.
If you want, do this:
Your download page is this.
12-01-2010 06:13 AM
"As I read your question and follow up, I wondered if this might be a USB power management issue. Can you check your power management settings to see if there is an option to enable / disable power saving on USB? "
I have checked this and turned off power management, but had no effect.
"... you can try to configure the various things that are being loaded at start up......"
At this stage, too many processes to test in startup for now. I may do it when i have more time and post the results.
12-01-2010 06:19 AM
"Uninstall Intel Matrix Storage Manager driver (you can install later if this doesn't solve your problem)."
How do I do this, I cant find this driver in "Devices"
I am running XP with Non-AHCI mode set in BIOS.
I have already tried updating chipset driver from Lenovo, but it made no difference, I have all latest drivvers installed as listed in your link.