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Re: Preventing delayed USB writes



On Tue, May 15, 2007 at 09:34:05AM -0700, pedxing wrote:
> Lenny AMD64.
> 
> When I write to a USB device (stick or mp3 player), I notice that
> the writes appear to happen quickly, but actually take a long time to
> complete.  I assume there is some form of caching going on.
> 
> To be safe, I issue a sync command from a terminal and wait for it
> (up to 15 minutes!) to complete before unmounting the drive.

when mounting the partition mount it with sync, but it get very slow.

15 minutes sounds way to slow, I write to my 8G usb 2.0 in about 2-3 min when I 
have done a lot of work on it and the system is busy.

is it registering as usb2 or 1.1 ?

> 
> Is there any way to prevent the caching from occuring?  I would like
> to configure things so that, for instance, when I (ok, actually my
> wife) use konqueror to copy songs to my mp3 player, when the copy
> dialog says 100%, I can immediately unmount the device without
> having to wait for a delayed write.
> 
> I have looked at the mount man page, but it says the sync option
> (which I think is what I want) is only available for ext2/3 and ufs
> file systems.
> 
> -Ped
> 
> 
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