Date: Tue, 23 Aug 2016 08:50:12 +0200 From: Gerhard Schmidt <estartu@ze.tum.de> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: Problems while reading from /dev/cd0 Message-ID: <ba79f0d6-a9e5-623c-d1b7-fb188202befb@ze.tum.de>
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Hi, 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. Reading directly with tar worked in the past. I really don't know how long it's there but i guess it's since i updated from FreeBSD 9 to FreeBSD 10. I running right now FreeBSD 10.3-RELEASE-p4 Here is the output from the kernel boot msg of the BRD Drive. cd0 at ahcich7 bus 0 scbus7 target 0 lun 0 cd0: <HL-DT-ST BD-RE BH16NS55 1.00> Removable CD-ROM SCSI device cd0: Serial Number SIK9JFANE175 cd0: 150.000MB/s transfers (SATA 1.x, UDMA6, ATAPI 12bytes, PIO 8192bytes) cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed Regards Estartu -- ---------------------------------------------------------- Gerhard Schmidt | E-Mail: schmidt@ze.tum.de Technische Universität München | Jabber: estartu@ze.tum.de WWW & Online Services | Tel: +49 89 289-25270 | PGP-PublicKey Fax: +49 89 289-25257 | on request
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