El día Friday, November 19, 2010 a las 12:39:13PM -0700, Warren Block escribió:
> > Just an idea: The USB key in question was new and I only created the > > file system on it the usual way (fdisk, bsdlabel, newfs). Then I > > restored the dump on it (which took 26 hours for 3.1 GByte dump file). > > The USB key boots fine, btw. > > 26 *hours*? USB 1.1? I don't think so. It is the Acer One D250 netbook. > Well, they could be anything. But the original filesystem has > formerly-used blocks with old data from deleted files. dump doesn't > copy those, but dd does. > > > Should I overwrite the full USB key from /dev/zero? > > Possibly there would still be differences. Filesystem metadata like > date last mounted, for example. If you want a block-by-block duplicate, > the brute-force method is to just dd the whole drive. Use bs=64k or > bs=1m to help reduce overhead. Warren, perhaps you missed my point. I have a prepared boot-able key and I want to give away a copy of it as a file on DVD. So I dd(1)'ed the key to disk and did this twice to ensure that the copy was fine, but the two files differ. How can I make sure that the file on disk (or DVD) is a exact copy of the key? matthias -- Matthias Apitz t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211 e <g...@unixarea.de> - w http://www.unixarea.de/ _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"