On Mon, Jun 23, 2008 at 2:23 PM, Roland Smith <[EMAIL PROTECTED]> wrote: > > I'm not sure about flash memory, but for a harddrive, simple writing 0's > is not a secure way to delete data. It can still be recovered.
Actually, this is for an experiment that I want to start with a "clean" device for. I'm not actually trying to obtain some level of security. > >> I'd rather not install a port, if I can avoid it. I > > Have a look at security/wipe. Before reading this, yes I did. In fact, I even installed it. However, the first operation appears to be a renaming of the file in question. I was doing: wipe -z /dev/da2 which was being kicked out with "Operation not permitted." It seemed to want to move/rename the file first. I didn't do enough digging to get around this before reading this e-mail. > > > I think the trick is to use the right block size. Try bs=512 or > 2048 in your dd command. Use if=/dev/random instead of if=/dev/zero and > repeat a couple of times. Note that wiping flash drives way will > shorten the lifespan of the device. > The man page says that a block size of 512 is the default, though I put it on the command line anyway (talk about being paranoid). My problem was the input file. I was using /dev/null instead of /dev/zero (which I didn't know about until this e-mail). Thanks guys. Andy -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"