Re: Unmounting/Ejecting removable media
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On Saturday 11 May 2013, Kailash Kalyani was heard to say:
> Hi Curt,
Good morning.
> Caching and I/O scheduling give performance benefits which is why
> they're used with most media.
As I said, I don't mean media where transaction times are critical or
anything like that. I mean USB devices, thumb drives and external
drives, which are already slow as molasses.
> As I understand it you're wondering
> if it is possible to disable write caching in Windows? The answer
> to that is yes.
Thank you for the pointer, I'll pass it on to a friend who uses
Windows.
My question was much more general than just Windows.
The problem of pulling a removable drive without unmounting it first
is a general problem. Caching that isn't immediately written out to
the drive appears to me to be "asking for trouble".
> From Kernel 2.6 onwards udev (http://wiki.debian.org/udev) is the
> dynamic device manager. But despite searching for a while I've not
> figured out how to control the rules for mounting the devices.
Thank you for taking your time to investigate. It is interesting, and
I will look at udeb myself as well.
> However, fstab entry "sync" or "async" controls what happens:
> http://www.tuxfiles.org/linuxhelp/fstab.html
Indeed. Removable drives not being in /etc/fstab is one of the
particulars that may make it possible to have caching "on" for static
drives, and "off" for removable. Hmmmm...
> Sincerely,
> Kailash
Peace,
Curt-
- --
The Magistrate, enrobed in taxes, condemns the thief in stolen rags.
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