On Mon, Feb 19, 2007 at 08:40:37PM +0100, Volker wrote: > Hi! > > For my dentist I'm currently in the process of destroying some tape > cartridges (SLR7) and also two hard disks (147G SCSI). > > As I started for the tapes, I've used dd to fill the tape with > random garbage. Just a simple `dd if=/dev/random of=/dev/nsa0'. > > The tape sits there since 48 hours writing a block of data every > other minute and still didn't fill up the tape completely. The > system this is running on is a P-4 3GHz machine using FreeSBIE 2.0 > (6.2-RELEASE based). > > I suspect this to be a slow /dev/random.
This sounds odd to me, I get 18-20MB/sec sustained read performance from /dev/random on this 2GHz system, which is probably faster than your tape write speed. > Is there any chance to speed up /dev/random? Would a hifn > accelerator card help here to get FreeBSD produce garbage faster? > > As there is medical data on all media I really need garbage > (/dev/zero wouldn't be enough for data security as this might get > recovered). Neither would a single pass with /dev/random, but you presumably knew this. Kris _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
