USB Devices not working
Shawn Iverson
shawn at nccsc.k12.in.us
Tue Feb 3 00:19:36 UTC 2004
> From: Fritz Whittington [mailto:f.whittington at att.net]
> Sent: Sunday, February 01, 2004 10:46 AM
>
>
> >> Also, once you are have troubleshooted your issue, always manually
> >> unmount
> >> your device before unplugging it, especially if you are
> performing write
> >> operations to it.
> >>
> How very important! If you don't believe that delayed-write is
> working, try mounting a USB fs (one that uses a solid-state
> memory, like
> Compact Flash or Smart Media), copying several MB of files
> from it to a
> hdd, and note how slow it is. Then delete all the files on the USB
> device, and copy all the files back. The copy is done almost in an
> instant! But then, when you unmount it, you can see it take several
> seconds to actually write the files from cache. So if you
> yanked it out
> without unmounting it, you wouldn't really have anything.
>
It would be nice if usb devices such as this could be forced to write their
data ASAP instead of waiting for a umount (despite a performance lag). It
is so tempting for many people that I know to just go ahead and unplug. I
am going to do some research on this.
More information about the fedora-list
mailing list