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擦洗和撕碎有什么区别？

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擦洗和撕碎有什么区别？

我知道两者都用于安全文件删除，但什么时候应该使用其中一个而不是另一个？两者都会用 0 覆盖文件吗？

答案1

这两个命令都使用模式覆盖数据。在什么情况下使用哪个命令肯定是一个见仁见智的问题，我可能会粉碎文件并清理磁盘，然而，这只是我的观点，以下信息可能对你有用。

 SHRED:  Note  that shred relies on a very important assumption: that the file system overwrites data in place.  This is the tradi‐
   tional way to do things, but many modern file system designs do not satisfy this assumption.  The following  are  examples  of  file
   systems on which shred is not effective, or is not guaranteed to be effective in all file system modes:

   * log-structured or journaled file systems, such as those supplied with AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)

   * file systems that write redundant data and carry on even if some writes fail, such as RAID-based file systems

   * file systems that make snapshots, such as Network Appliance's NFS server

   * file systems that cache in temporary locations, such as NFS version 3 clients

   * compressed file systems

   In  the  case  of  ext3 file systems, the above disclaimer applies (and shred is thus of limited effectiveness) only in data=journal
   mode, which journals file data in addition to just metadata.  In both the data=ordered (default)  and  data=writeback  modes,  shred
   works as usual.  Ext3 journaling modes can be changed by adding the data=something option to the mount options for a particular file
   system in the /etc/fstab file, as documented in the mount man page (man mount).

   In addition, file system backups and remote mirrors may contain copies of the file that cannot be removed, and  that  will  allow  a
   shredded file to be recovered later.

来源‘man shred’

擦洗： 擦洗

图片来源：软件中心

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