看对手的能力和愿意花费的时间
gutmann应该是这篇
https://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html
这篇的引用链接，有闲可以看看。
没耐心的。看Introduction，介绍某些做法的来由
和那堆Epilogue。
If you're using a drive which uses encoding technology X, you only need to p
erform the passes specific to X, and you never need to perform all 35 passes
. For any modern PRML/EPRML drive, a few passes of random scrubbing is the b
est you can do. As the paper says, "A good scrubbing with random data will d
o about as well as can be expected". This was true in 1996, and is still tru
e now.
我觉得，以当今的存储密度，填0足够了。
如果不放心,把 /dev/zero换成/dev/random也可以，只是慢点。
【 在 richiter 的大作中提到: 】
: 我搜了下，是这么说的
: “只填一遍 0 可以利用专门的工具来恢复数据，因为磁性是有残留的
: 安全数据删除我介绍过很多次了，著名的 Gutmann 方法，
: ...................
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