-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 10/25/07 01:19, Bob wrote: > if you type > dd if=/dev/urandom of=/dev/null count=100000 > 100000+0 records in > 100000+0 records out > 51200000 bytes (51 MB) copied, 14.0076 seconds, 3.7 MB/s > > whereas > dd if=/dev/zero of=/dev/null count=100000 > 100000+0 records in > 100000+0 records out > 51200000 bytes (51 MB) copied, 0.0932449 seconds, 549 MB/s > > Is there a faster source or random or pseudo-random numbers because at > 4MB/s it'll take a loooong time to blank a 60GB drive let alone a 500GB > job? > > Maybe we could use 10 (or 100) files on RAM disk each 1MB in size filled > by /dev/urandom, then use /dev/random and some algorithm to determine > what portion of what file to use, using random to string together chunks > of pseudo-random files, you could also randomly replace/refill files, > it's not ideal but it should be good enough and if we could get it fast > enough so that it's the drive write speed that the bottle neck that > would be perfect. > > What other options are there?
Why roll your own when there are *MANY* disk wipers out there. Everything from srm & sfill in the secure-delete package, to wipe, to dban.sourceforge.net. - -- Ron Johnson, Jr. Jefferson LA USA Give a man a fish, and he eats for a day. Hit him with a fish, and he goes away for good! -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHIEAOS9HxQb37XmcRAsDJAKDNYfJXp/cty2tXsbyEbay5wJ7jHwCg1GPv N32YG5yO2NetMdfg9+Zylnw= =wDKf -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
