Date: Sun, 12 Aug 2001 00:55:30 -0500 From: Mike Meyer <mwm@mired.org> To: <joerg@FreeBSD.org> Cc: freebsd-bugs@FreeBSD.org Subject: Re: bin/20725: Raw floppy writes fail for partial bytes. Message-ID: <15222.6738.319729.986142@guru.mired.org> In-Reply-To: <200108101249.f7ACnWi99159@freefall.freebsd.org> References: <200108101249.f7ACnWi99159@freefall.freebsd.org>
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joerg@FreeBSD.org types: > Synopsis: Raw floppy writes fail for partial bytes. > > State-Changed-From-To: open->closed > State-Changed-By: joerg > State-Changed-When: Fri Aug 10 14:47:07 MEST 2001 > State-Changed-Why: > This is normal and expected behaviour for a `raw' device: all IO > requests need to be multiples of the hardware block size (typically > 512 bytes, but can be larger iff the medium block size is larger, like > for non-standard floppies, MO media, or CD-ROMs). While I don't object to this being closed, I'd like for a couple of comments to make it into the PR log. First, /dev/fd is historically not a raw device on FreeBSD, or Unix in general. This means that instructions written for Unix in general - like those at <URL: http://www.uruk.org/orig-grub/install.html > - which used to work on FreeBSD are no longer correct. This pr was filed because I noticed that this no longer worked. > Use a tool like tar or cpio when copying arbitrary stuff to raw > devices. Those can't be used to build a boot floppy. The correct tool for writing arbitrary data to a floppy is still dd, you just have to account for their being no cooked floppy device: dd if=TESTFILE of=/dev/fd0 bs=512 conv=sync which will pad the last input block. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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