Date: Mon, 4 May 2020 00:03:36 +0200 From: Arne Steinkamm <freebsd-questions@Steinkamm.COM> To: Christoph Kukulies <kuku@kukulies.org> Cc: freebsd-questions@freebsd.org, arne@steinkamm.com Subject: Re: dd: /dev/cd0: Invalid argument Message-ID: <20200503220336.GG82984@trajan.stk.cx> In-Reply-To: <B0B4F1EA-8BAC-467F-A399-A0DC2720C149@kukulies.org> References: <B0B4F1EA-8BAC-467F-A399-A0DC2720C149@kukulies.org>
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Hi, On Sun, May 03, 2020 at 09:56:16PM +0200, Christoph Kukulies wrote: > I got a bit further with seeing my old SCSI-Periphals on the external SCSI bus connected to the sym0 (ASUS SC-200 Interface). > > I can dd one of the disks connected there (/dev/da0) completely (2GB) > > But I cannot dd if=/dev/cd0 of=cd_dump > > Doing this, I???m getting > > $ dd if=/dev/cd0 of=cd_dump > dd: /dev/cd0: Invalid argument > 0+0 records in > 0+0 records out > 0 bytes transferred in 0.000199 secs (0 bytes/sec) > $ > > What???s wrong? /dev/da0 and /dev/cd0 are both character devices. I can well cat /dev/cd0 >dump . The blocksize of CDs is 2k so use 2k or a multiplier of it. dd if=/dev/cd0 ibs=2k of=cd_dump .//. Arne -- Arne Steinkamm | Home: Mail: arne<at>steinkamm<dot>com
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