Date: Thu, 1 Feb 1996 20:12:21 +0200 (EET) From: "Andrew V. Stesin" <stesin@elvisti.kiev.ua> To: rgrimes@GndRsh.aac.dev.com (Rodney W. Grimes) Cc: stesin@elvisti.kiev.ua, hackers@FreeBSD.org, ccd@forgery.CS.Berkeley.EDU Subject: Re: Am I root?! or How to mirror an 'a' partition? Message-ID: <199602011812.UAA07298@office.elvisti.kiev.ua> In-Reply-To: <199602011624.IAA20540@GndRsh.aac.dev.com> from "Rodney W. Grimes" at Feb 1, 96 08:24:32 am
next in thread | previous in thread | raw e-mail | index | archive | help
Hello, [...] # Because the first 16 blocks of the a partition are special, they # contain the bootblocks and disklabel. These are protected from # writes and require a special ioctl to be able to write them. # > # > dd if=/dev/rsd0a of=/dev/rsd1a bs=16b skip=1 # # Try adding a seek=1 so you skip over the first 16b of the output # device too. Skip only effects the input file. Oh, God. Shame on me. I apologize for the dumb question. Probably beer made me blind while doing RTFM on dd (1). )-; sd (4) doesn't clearly state that first 16b are R/O even if the disk is _not_ mounted at all, BTW. One need to read IOCTLS section carefully to figure the idea. Can this fact be added to the sd (4) manpage? Thanks a lot for the solution! # -- # Rod Grimes rgrimes@gndrsh.aac.dev.com # Accurate Automation Company Reliable computers for FreeBSD # -- With best regards -- Andrew Stesin. +380 (44) 2760188 +380 (44) 2713457 +380 (44) 2713560 "You may delegate authority, but not responsibility." Frank's Management Rule #1.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199602011812.UAA07298>