On Thu, May 16, 2013 at 5:08 PM, Bob Bishop <[email protected]> wrote: > Hi, > > On 16 May 2013, at 21:51, Zaphod Beeblebrox wrote: > > > I have to retrieve some very old backups. They were made on FreeBSD and > > are on tape... specifically DDS4. [etc] > > However, attached to either controller (after a reboot of the machine > and a > > powercycle of the drive), I get: > > > > [1:25:325]root@run:/home/foo> dd if=/dev/sa0 of=tape5 > > dd: /dev/sa0: Input/output error > > 0+0 records in > > 0+0 records out > > 0 bytes transferred in 0.002930 secs (0 bytes/sec) > > > > ... which is a return code of '1' and no messages on the console... > > > > I have, before you ask, tried "bs=10k" and 20k ... but I believe this > > command should run by itself fetching the first 512 bytes of each block > --- > > narrowing down the block size logically comes after making the tape go. > > > Try bs=64k >
Same result. Besides, as far as I understand, the proper operation (if the blocksize is too small) is to read the first $n bytes and then write them to the output.. But same result. _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
