On 24/05/2010 1:23 π.μ., Doug Hardie wrote: > I am periodically backing up a bunch of files to DVD. I use mkisofs to > create the original image and growisofs to write it to a real DVD. However, > at that point I want to verify that the write was successful. I tried using > dd to read back in the DVD to a file. Its interesting that the bs parameter > must be at least 2048 or dd complains about a parameter error. However, the > big issues is that the original image file is shorter than the read file. > The difference is 10240 bytes. This difference is the same for bs 2048, > 10240, or 102400. It appears that dd is adding one last block. Is there a > way to prevent this or remove that block? >
Use the count= parameter in dd to read the exact count of blocks in the DVD. Use isoinfo to obtain this information from the media itself. Have a look at the instructions here: http://www.troubleshooters.com/linux/coasterless.htm _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
