Does linux have some form of virtual block device that could be used to create a /dev/XXb, /dev/XXb1. In freebsd to get to this whole device image I would do (using linux file system paths to make it easier to understand):
dd if=/dev/sdb of=imageofdisk.img mdconfig -f imageofdisk.img # This would create /dev/mda, /dev/mda1 mount -t msdos /dev/mda1 /mnt I could also do fdisk /dev/mda at that point and see the partition table. Could also do dd if=/dev/mda of=/dev/sdc # Create a new copy dd if=imageofdisk.img of=/dev/sdc # Same > Ditto what Tomas said. For looking at it locally, dd'ing the partition > (/dev/sdb1) is fine, but to make a full backup of the CF card so that you > can reproduce it, you want an image of /dev/sdb as well. The loopback > device (see losetup) is a fun trick, worth learning about. Yes, very important point here... > > On Thu, Aug 8, 2019 at 9:50 AM Tomas Kuchta <tomas.kuchta.li...@gmail.com> > wrote: > > > If you dd sdb1, you will still need the boot sector and partition table > > from sdb to be able to use the new CF card. > > > > -T > > > > On Thu, Aug 8, 2019, 12:25 <mich...@robinson-west.com> wrote: > > > > > That's the secret sauce! /dev/sdb1 instead of /dev/sdb. Thank you ;-) > > > > > > August 8, 2019 11:19 AM, a...@clueserver.org wrote: > > > > > > > On your dd command try using /dev/sdb1 instead of /dev/sdb. > > > > > > > > dd if=/dev/sdb1 of=image.img > > > > > > > > mount -o loop image.img /mnt > > > > > > > >> [mrobinson@turion-roch-robinson-west-com ~]$ sudo fdisk -l /dev/sdb > > > >> > > > >> Disk /dev/sdb: 1018 MB, 1018773504 bytes, 1989792 sectors > > > >> Units = sectors of 1 * 512 = 512 bytes > > > >> Sector size (logical/physical): 512 bytes / 512 bytes > > > >> I/O size (minimum/optimal): 512 bytes / 512 bytes > > > >> Disk label type: dos > > > >> Disk identifier: 0x001c2022 > > > >> > > > >> Device Boot Start End Blocks Id System > > > >> /dev/sdb1 * 63 1989791 994864+ c W95 FAT32 (LBA) > > > >> [mrobinson@turion-roch-robinson-west-com ~]$ > > > >> > > > >> The partition starts at 63, how do I use losetup? > > > >> > > > >> August 8, 2019 10:42 AM, "Ken Stephens" <kennethgsteph...@gmail.com> > > > >> wrote: > > > >> > > > >>> Micheal, > > > >>> > > > >>> You using losetup to mount the image to a /dev/loop0? > > > >>> > > > >>> Ken > > > >>> > > > >>> On Thu, Aug 8, 2019 at 8:37 AM <mich...@robinson-west.com> wrote: > > > >> > > > >> The server uses a CF card in place of a hard disk. The server oddly > > > >> enough > > > >> is Windows 98 SE based. I have a CentOS 7 box with a USB CF card > > > >> reader. > > > >> I am trying to image the CF card and write the image to a second CF > > > >> card. > > > >> Kind of a, make a backup to experiment with scenario and use the > > > >> backup. > > > >> > > > >> This my CentOS 7 box doesn't work: > > > >> > > > >> $ sudo dd if=/dev/sdb of=win98seQSP2predrivers.img bs=1M count=1000 > > > >> status=progress > > > >> > > > >> The file created cannot be mounted. If you write it to another CF > > card, > > > >> you get garbage. > > > >> _______________________________________________ > > > >> PLUG mailing list > > > >> PLUG@pdxlinux.org > > > >> http://lists.pdxlinux.org/mailman/listinfo/plug > > > >>> _______________________________________________ > > > >>> PLUG mailing list > > > >>> PLUG@pdxlinux.org > > > >>> http://lists.pdxlinux.org/mailman/listinfo/plug > > > >> > > > >> _______________________________________________ > > > >> PLUG mailing list > > > >> PLUG@pdxlinux.org > > > >> http://lists.pdxlinux.org/mailman/listinfo/plug > > > > > > > > Q: Why do programmers confuse Halloween and Christmas? > > > > A: Because OCT 31 == DEC 25. > > > > > > > > _______________________________________________ > > > > PLUG mailing list > > > > PLUG@pdxlinux.org > > > > http://lists.pdxlinux.org/mailman/listinfo/plug > > > _______________________________________________ > > > PLUG mailing list > > > PLUG@pdxlinux.org > > > http://lists.pdxlinux.org/mailman/listinfo/plug > > > > > _______________________________________________ > > PLUG mailing list > > PLUG@pdxlinux.org > > http://lists.pdxlinux.org/mailman/listinfo/plug > > > _______________________________________________ > PLUG mailing list > PLUG@pdxlinux.org > http://lists.pdxlinux.org/mailman/listinfo/plug > -- Rod Grimes rgri...@freebsd.org _______________________________________________ PLUG mailing list PLUG@pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug
