Date: Wed, 7 Jan 2004 21:07:09 +0000 From: Scott Mitchell <scott+freebsd@fishballoon.org> To: Hendrik Hasenbein <hhasenbe@techfak.uni-bielefeld.de> Cc: "W. Sierke" <ws@au.dyndns.ws> Subject: Re: How to create .iso file image of cdrom (atapi)? Message-ID: <20040107210709.GA504@tuatara.fishballoon.org> In-Reply-To: <3FFC3C6B.3020809@techfak.uni-bielefeld.de> References: <02b401c3d2d7$81439f40$8464a8c0@ovirt.dyndns.ws> <20040107081315.0786de1e.doublef@tele-kom.ru> <20040107093611.0a7983df.doublef@tele-kom.ru> <20040107094356.V24917@zoraida.natserv.net> <3FFC3C6B.3020809@techfak.uni-bielefeld.de>
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On Wed, Jan 07, 2004 at 06:05:47PM +0100, Hendrik Hasenbein wrote: > Francisco Reyes wrote: > >Other than speed is there any consideration about the buffer size? > I assume you are referring to the 'bs=2048' argument to dd. > The argument 'bs=2048' sets the block size to be used for the device. > You can't use another value for cdrom drives than 2048 except you are > able to change the blocksize on the drive. Some can be jumpered for 512 > per block, but there is no need to do that. If you use another value for > bs the operation will fail on a cdrom drive. Well, you can use a bs value that is a multiple of 2048 (like the 64k in my previous example). Using a larger block size will generally speed up the transfer, up to a point. Scott -- =========================================================================== Scott Mitchell | PGP Key ID | "Eagles may soar, but weasels Cambridge, England | 0x54B171B9 | don't get sucked into jet engines" scott at fishballoon.org | 0xAA775B8B | -- Anon
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