Date: Sun, 28 Dec 2008 13:36:03 -0700 From: Tim <tajudd@gmail.com> To: David Scialom <dscialom@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Unable to modify sysid with Fdisk Message-ID: <4957E333.1050103@gmail.com> In-Reply-To: <c4a0126f0812280845q5bcab455u70d07038aa0b27e2@mail.gmail.com> References: <c4a0126f0812280845q5bcab455u70d07038aa0b27e2@mail.gmail.com>
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David Scialom wrote: > Hello, > > It seems that it is impossible to modify the sysid with fdisk since FreeBSD > 6.2. I am actually using FreeBSD7.0. > When I want to modify my the sysid from 165(ufs) to 12(Fat32) i get the > message "Geom not found: da0" and no change is made: da0 is stock with sysid > = 165. The detail are provided below. I tried also to do the same from the > install FreeBSD CD without success. > > As someone a solution ? > > Zurich# fdisk -u da0 > ******* Working on device /dev/da0 ******* > parameters extracted from in-core disklabel are: > cylinders=1009 heads=64 sectors/track=32 (2048 blks/cyl) > > parameters to be used for BIOS calculations are: > cylinders=1009 heads=64 sectors/track=32 (2048 blks/cyl) > > Do you want to change our idea of what BIOS thinks ? [n] > *fdisk: invalid fdisk partition table found* > Media sector size is 512 > Warning: BIOS sector numbering starts with sector 1 > Information from DOS bootblock is: > The data for partition 1 is: > sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD) > start 32, size 2066400 (1008 Meg), flag 80 (active) > beg: cyl 0/ head 1/ sector 1; > end: cyl 1008/ head 63/ sector 32 > Do you want to change it? [n] y > Supply a decimal value for "sysid (165=FreeBSD)" [165] 12 > Supply a decimal value for "start" [32] > Susysid 12 (0x0c),(DOS or Windows 95 with 32 bit FAT (LBA)) > start 32, size 2066400 (1008 Meg), flag 80 (active) > beg: cyl 0/ head 1/ sector 1; > end: cyl 1008/ head 63/ sector 32 > Are we happy with this entry? [n] y > The data for partition 2 is: > <UNUSED> > Do you want to change it? [n] > The data for partition 3 is: > <UNUSED> > Supply a decimal value for "size" [2066400] > Explicitly specify beg/end address ? [n] > sysid 12 (0x0c),(DOS or Windows 95 with 32 bit FAT (LBA)) > start 32, size 2066400 (1008 Meg), flag 80 (active) > beg: cyl 0/ head 1/ sector 1; > end: cyl 1008/ head 63/ sector 32 > Are we happy with this entry? [n] y > The data for partition 2 is: > <UNUSED> > Do you want to change it? [n] > The data for partition 3 is: > <UNUSED> > Do you want to change it? [n] > The data for partition 4 is: > <UNUSED> > Do you want to change it? [n] > Partition 1 is marked active > Do you want to change the active partition? [n] y > Supply a decimal value for "active partition" [1] > Are you happy with this choice [n] y > > We haven't changed the partition table yet. This is your last chance. > parameters extracted from in-core disklabel are: > cylinders=1009 heads=64 sectors/track=32 (2048 blks/cyl) > > parameters to be used for BIOS calculations are: > cylinders=1009 heads=64 sectors/track=32 (2048 blks/cyl) > > Information from DOS bootblock is: > 1: sysid 12 (0x0c),(DOS or Windows 95 with 32 bit FAT (LBA)) > start 32, size 2066400 (1008 Meg), flag 80 (active) > beg: cyl 0/ head 1/ sector 1; > end: cyl 1008/ head 63/ sector 32 > 2: <UNUSED> > 3: <UNUSED> > 4: <UNUSED> > Should we write new partition table? [n] y > fdisk: Geom not found: "da0" > Zurich# fdisk da0 > ******* Working on device /dev/da0 ******* > parameters extracted from in-core disklabel are: > cylinders=1009 heads=64 sectors/track=32 (2048 blks/cyl) > > parameters to be used for BIOS calculations are: > cylinders=1009 heads=64 sectors/track=32 (2048 blks/cyl) > > fdisk: invalid fdisk partition table found > Media sector size is 512 > Warning: BIOS sector numbering starts with sector 1 > Information from DOS bootblock is: > The data for partition 1 is: > sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD) > start 32, size 2066400 (1008 Meg), flag 80 (active) > beg: cyl 0/ head 1/ sector 1; > end: cyl 1008/ head 63/ sector 32 > The data for partition 2 is: > <UNUSED> > The data for partition 3 is: > <UNUSED> > The data for partition 4 is: > <UNUSE > The "Warning: Invalid fdisk partition table found" is a red flag to me. If the partition boundries don't lie on a cylinder, than it's invalid. I also see after it prints partition 3, it randomly asks for the size of the partition, without asking for anything else. I think those first 512 sectors are messed up. If I were you, I'd wipe the first 2 tracks of the disk. dd if=/dev/zero bs=512 count=128 of=/dev/da0 And recreate the partition then. fdisk isn't seeing a sane layout to begin with and it may silently be discarding the changes asked. Good luck.
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