On Fri 19 Dec 2014 at 11:47:38 +0100, Frédéric Marchal wrote: > 2014-12-19 11:28 GMT+01:00 Renaud OLGIATI <ren...@olgiati-in-paraguay.org>: > > On Fri, 19 Dec 2014 10:15:32 +0000 > > Brian <a...@cityscape.co.uk> wrote: > > > >> > I plug in a USB pen drive, and launch dd to copy an iso image. > >> > # dd bs=4M if=debian-live-7.6.0-amd64-rescue.iso of=/dev/sdi && sync > >> > dd: opening `/dev/sdi': Read-only file system > > > >> It contains am ISO9660 file system which, by design, is read-only. > > > > No, when I launch dd it contains a FAT32 file system. > > > >> > Is there a way to force it to mount read-write ? > > > >> Nothing is mounted during the reading and writing process. > > > > Then why does dd complain, and refuse to run ? > > There is nothing to mount here as that dd command is writing to the > whole disk (of=/dev/sdi). It bypasses the partition table and the file > system. > > Do you run the command as root? A user can't write to a device > (imagine anybody could run dd if=/dev/zero of=/dev/sda where sda is a > system disk).
A user can write to a USB stick on Wheezy (which seems reasonable to me) but not on testing/unstable. Not that that has anything to do with the OP's problem. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/19122014115041.f3aa7908c...@desktop.copernicus.demon.co.uk
