Very thanks Jay Lessert , who points out newfs doesn't do anything to data blocks, therefore, it is not appropriate solution to wipe out data. label in format doesn't really touch data also. the most popular one is dd if=/dev/zero of=/dev/dsk/c0t1d0s2 bs=1024k which takes half to an hour to clear one 9GB SCIS disk, but it can run multiple dd processes simultaneously to deal with more than one disk an alternative, An appropriate low-security disk wipe would be something like: [edited for brevity, format is more verbose] % sudo format -d c1t3d0 format> analyze analyze> setup Analyze entire disk[yes]? Loop continuously[no]? Enter number of passes[2]: 1 Repair defective blocks[yes]? Stop after first error[no]? Use random bit patterns[no]? yes Enter number of blocks per transfer[126, 0/0/126]: Verify media after formatting[yes]? Enable extended messages[no]? yes Restore defect list[yes]? Restore disk label[yes]? analyze> write pass 0 - pattern = 0x657eb725 This probably takes about the same time as dd-ing /dev/zero in, the pseudo-random data gives a far better wipe than all-zeros, it imposes just about zero cpu load (unlike dd), and your SCSI chain should be able to run four of these in parallel with no slowdown. This doesn't protect you against government "TLA" agencies, but it gets everybody else. :-) _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagersReceived on Wed Mar 6 15:00:12 2002
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