On 23 Aug 2016, at 08:50, Gerhard Schmidt <[email protected]> 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. -Dimitry
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