在将我自己的操作系统添加到硬盘上之前，我正要对从商店买来的硬盘进行存档，考虑到这是一台以折扣价购买的二手演示机，硬盘可能在后台没有清理干净，所以我选择先在其上运行 ntfswipe（因为 0x00000000000000000 压缩效果非常好，呵呵），
root@xubuntu:/home/xubuntu# ntfswipe -a /dev/nvme0n1p3
ntfswipe is about to wipe:
unused disk space
file tails
unused mft areas
unused directory index space
the logfile (journal)
the pagefile (swap space)
undelete data
ntfswipe will overwrite these areas with: 0x00
(however undelete data will be overwritten by random values)
ntfswipe will begin in 5 seconds, press CTRL-C to abort.
wipe_directory 0x00, 65016584 bytes
wipe_tails 0x00, 221482103 bytes
wipe_logfile 0xff, 67108864 bytes
wipe_mft 0x00, 187170816 bytes
wipe_pagefile 0x00, 5368709120 bytes
wipe_unused 0x00, 460829704192 bytes
wipe_undelete
466739191679 bytes were wiped (excluding undelete data)
这里的问题是，正如标题所述，为什么它会说：
(however undelete data will be overwritten by random values)
? 当其他所有内容都被 0x00 或 0xFF 覆盖时，为什么取消删除的数据看似是随机的？