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Re: 1.7.7 on Windows 7: can't write to removable disk
- From: Latchen McKinney <latchwoof at yahoo dot com>
- To: "cygwin at cygwin dot com" <cygwin at cygwin dot com>
- Date: Thu, 21 Feb 2013 14:55:11 -0800 (PST)
- Subject: Re: 1.7.7 on Windows 7: can't write to removable disk
- Reply-to: Latchen McKinney <latchwoof at yahoo dot com>
> On Jan 11 15:55, Corinna Vinschen wrote:
> > On Jan 11 15:51, Corinna Vinschen wrote:
> > > On Jan 10 10:40, tomas@datasupporten.se wrote:
> > > > Hello.
> > > > I'm trying to write a disk image to a compact flash card with dd, but I
> > > > get the error:
> > > > "dd: writing to /dev/sdj: Permission denied"
> > > >
> > > > Apart from the CF-card, I also tried a USB-stick with the same results.
> > > > I'm logged in as administrator.
> > >
> > > Please have a look into http://support.microsoft.com/kb/942448 first.
> > >
> > > [...listening "De-Loused In The Comatorium" while waiting...]
> > >
> > > Finished reading? Ok.
> > >
> > > That's quite a serious restriction starting with Vista. If I destroy the
> > > filesystem on one of my sd cards under Linux, I can then overwrite it
> > > with dd under Cygwin. However, if that dd call created a valid
> > > filesystem on the sd card, the next write fails again. For some reason
> > > it does not help to unmount the filesystem on the drive via the "Disk
> > > Management" MMC snap-in, despite the claim in the aforementioned
> > > article.
> > >
> > > The solution I just checked in to Cygwin is rather complicated, but
> > > I really tested this a couple of hours now, and I didn't find any
> > > other solution.
> >
> > I forgot the disclaimer:
> >
> > Please test the next developer snapshot from http://cygwin.com/snapshots/
>
> Update: I checked in a revised version of the patch.
> The code from yesterday tried to lock all partitions at open() time at
> once, which is hardly minimal-invasive. It would even try to lock all
> partitions if you just overwrite the boot sector.
> With the new code, a partition lock is only triggered on-demand. As
> soon as a write() call fails with "Access denied", it searches the
> partition table for a partition which overlaps with the current write
> position and then tries to lock only that partition.
>
Hello!
I am curious if this patch was included in the live build of cygwin. ?I use dd for archiving and making new copies of floppy disks from images, and I can no longer do that in Windows 7. ?I, too, get the error message:
"dd: writing to /dev/fd0: Permission denied"
Warmest regards.
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