On Jan 11 15:55, Corinna Vinschen wrote: > On Jan 11 15:51, Corinna Vinschen wrote: > > On Jan 10 10:40, to...@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. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
