Am 23.08.2016 um 13:12 schrieb Dimitry Andric: > On 23 Aug 2016, at 08:50, Gerhard Schmidt <esta...@ze.tum.de> wrote: >> >> I'm having some very curios Problems while reading from an BD-R recorded >> as a tar directly on the disk without a filesystem. >> >> When i try to read the Disk via 'tar tvvf /dev/cd0' >> >> i get the following output >> >> -rw-r--r-- 0 root wheel 5793264611 1 Jan 2015 file1.db >> tar: Error reading '/dev/cd0' >> Archive Format: POSIX ustar format, Compression: none >> tar: Error exit delayed from previous errors. >> >> reading the whole file via 'dd if=/dev/cd0 of=backup.tar bs=2048' and >> than 'tar tvvf backup.tar' the file is read without a hitch. So the data >> on the disk is OK but can't be read directly by tar. >> >> if i try the dd without the bs=2048 i get >> >> dd: /dev/cd0: Invalid argument >> 0+0 records in >> 0+0 records out >> 0 bytes transferred in 0.000115 secs (0 bytes/sec) >> >> So there is a problem reading anything other than 2048 byte blocks from >> a Disk. > > Have you tried tar's -b option, to set the block size 2048? Maybe that > will help.
It does partially. extracting the files work but testing the archive with tar t fails. Estartu -- ---------------------------------------------------------- Gerhard Schmidt | E-Mail: schm...@ze.tum.de Technische Universität München | Jabber: esta...@ze.tum.de WWW & Online Services | Tel: +49 89 289-25270 | PGP-PublicKey Fax: +49 89 289-25257 | on request _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
