"Secure delete" function in
context menu and in "File tools" submenu is intended for secure
deletion of file
and folders, also known as file shredding, or data erasure, a
permanent and unrecoverable deletion of data.
utility accepts multiple files and/or directories as input and provides
multiple overwriting of file data with random data stream (AES256 CTR)
forcing flush to disk each time, then replacement of content with
randomly sized random data to fake file size, and multiple renaming of
the file with random string.
Please use it
carefully since securely deleted data will reasonably be not
recoverable with known means.
Anyway please note that secure file deletion doesn’t overcome all known
risks of data leakage, since may exist copies of the data as temporary
files saved by application that accessed the file, or as not securely
deleted older version of the file, or cached by the system: clearing a
file cannot affect that data, which can be recovered with software
utilities or specific hardware probes.
based storage usually re-allocates sectors for writing
transparently for the software, in order to reduce unit’s wear since
flash units have a shorter lifespan in terms of writes; this doesn’t
allow to efficiently physically overwrite original content, reducing
the efficiency of file shredding.
In those cases only erasing the whole disk (with one or more random
data passage on all the free space) would be effective, but this
can be very time consuming and, for flash based or hybrid drives, it
will lead to
fast wear and reduced lifespan of devices (disk whiping is currently
implemented PeaZip’s secure file deletion procedure).
As an alternative to secure deletion PeaZip provides a fast deletion
menu entry that delete files and folders without moving data to the
recycle bin, which is faster and increases security against forgetting
of recycled data.
Like secure deletion, fast deletion does not allows to recover data
from the system's recycle bin, but as it is not intended for securely
sanitizing data, it is feasible to recover data destroyed with fast
deletion with appropriate undelete utilities.
Topics: secure delete, permanently erase files, secure
file deletion program,
data clearing software, freeware data whiping, data sanitization
application, data recovery, file
recovery, erase files, erase data, not recoverable data erasure,
permanent file erase.