Question about USB R/W Speed

[Lisa Kachold]

Hey Mark,

On Thu, Feb 2, 2012 at 9:07 AM, Mark Phillips <mark at phillipsmarketing.biz>wrote:

>
>
> On Thu, Feb 2, 2012 at 9:02 AM, Matt Graham <danceswithcrows at usa.net>wrote:
>
>> From: Mark Phillips <mark at phillipsmarketing.biz>
>> > Gnome reported that the transfer speed was around 400 - 500 KB/sec.
>> > I then plugged the same stick into the same port on my laptop, but
>> > transferred files (~1.5 GB lots of little files) from Windows 7
>> > running in VMPlayer, and got a transfer speed of 4-5 MB/sec - 10
>> > times faster! Is there some magic in windows that makes USB sticks
>> > faster?
>>
>> If ehci_hcd isn't loaded, then USB2 devices will be limited to USB1
>> speeds.
>> If a device is mounted with "-o sync", I/O on that device will be slower
>> (but
>> it shouldn't have been that slow).  If you're using an automounter, that
>> automounter may mount removable media with -o sync .  Finally, your USB
>> device
>> may have some sort of flag in unusual_devs.h that says "This device may
>> not
>> work reliably at high speed; force it to low"--but I think that'd be
>> unlikely.
>>  Check the presence of ehci_hcd first.
>>
>> OK, # lspci |grep -i ehci
> 00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
> Controller #2 (rev 03)
> 00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
> Controller #1 (rev 03)
>
> I assume that means it is ok. How do I check if devices are automounted
> with -o sync (debian testing)?
>
> Mark
>
> See Mounts (including automounts):
# sudo mount

See disks
# sudo blkid

Use the source:

# man mount
# man blkid
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