Date: Fri, 10 Jan 2003 09:30:37 +1100 From: "Pietralla, Siegfried P" <siegfried.pietralla@eds.com> To: "'freebsd-questions@freebsd.org'" <freebsd-questions@freebsd.org> Subject: dd to /dev/ar0s1 fails with fixlabel: invalid magic Message-ID: <16649A8D5C73D51183B80008C728EEB7CC0BBB@AUSYM103>
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hi all, i'm trying to copy a dos partition from one disk to another like so: dd if=/dev/ad3s1 of=/dev/ar0s1 bs=128k and it's failing with: dscheck(#ar/0x20002): fixlabel: invalid magic fixlabel: invalid magic dd: /dev/ar0s1: Read-only file system i'm running freebsd v4.6.2 . i'm booting from ar0s3 - i've never used ar0s1 ( it's a new disk ) and i installed straight from the cd onto this disk. i guess the install procedure may have disklabel'd it since i set the first three slices to freebsd even though i only created partitions in ar0s3. i've checked groups.google.com and there are two other reports of the same problem: one person trying to zero out a slice and one trying to recover a dos slice. both have no reported solution! also i think someone tried to newfs_msdos and failed the same way but it's in russian so i can't quite work it out :) a work around appears to be using ar0 instead, e.g.: dd if=/dev/zero of=/dev/ar0 count=10 oseek=63 which does succeed in zeroing the first ten blocks of ar0s1. however when i then try to restore my dos slice i still get: dd if=/dev/ad3s1 of=/dev/ar0s1 dd: /dev/ar0s1: Read-only file system so i need to go via ar0 again: dd if=/dev/ad3s1 of=/dev/ar0 oseek=63 which finally works :) also, i can dd a freebsd slice without any problems, e.g. dd if=/dev/ar0s3 of=/dev/ar0s2 my question then is, what's the 'proper' way to retrieve a slice from freebsd's grasp? ( so that i can then get dd to work as i want it to ). thanx, siegfried. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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