Supposedly it will allow you to fully overwrite empty disk space with 0x00 and 0xFF. There is some further information here which I could find about the usage of the command. I could not find too much information on to what extent is this true and can it be relied on to securely delete data permanently? The old bugaboos about multiple pass wipes being necessary to thwart magnetic force microscope recovery of partial track wipes is urban legend.
Even then it was a laboratory curiosity never successfully demonstrated at scales beyond a few bytes. A one pass write of anything; zeroes, random, pattern, whatever, securely wipes the data.
The hard part is actually overwriting the data, because the data is often not as static as it seems. For the most part, this works as you would think. File storage is allocated in blocks. Any file that does not use an exact multiple of blocks will have filler making up the difference.
Typically this is fragments of whatever file last used this disk block. Realistically, this is a relatively low risk of useful content. On solid state drives with properly functioning TRIM, slack space should be empty. Tracks that have been remapped due to failures may contain chunks of data that will not be touched by overwrite attempts. Generally these are genuinely bad and data is not retrievable, or even if retrieved contains system fragments not associated with anything important.
Solid state drives attempt to reduce wear by switching out memory chunks internally. When this happens, old data cannot be reached to overwrite it. Even if this is done, good luck getting anything useful from it. Deb is a tech editor, developmental editor, and contributor to over 20 add The cipher. It allows you to do the same tasks—encrypt and decrypt—that you can do through the GUI, but also allows you to do much more—all through the command line.
This Daily Drill Down will introduce you to the cipher tool and walk you through the steps of using its various switches. Why a command line encryption tool? For example, what if a user wants to create a new file encryption key? You might think you could generate a new key pair by requesting a new EFS certificate. What if you want to encrypt files that are already encrypted? With the cipher tool, you can force encryption on all files and folders, including those that are already encrypted.
Active 2 years, 1 month ago. Viewed 10k times. Improve this question. Hashim Aziz. Hashim Aziz Hashim Aziz 9, 26 26 gold badges 73 73 silver badges bronze badges.
I can draw a logical conclusion based on what detail MS provides for us to read, and some plain old common sense. PimpJuiceIT A logical inference from a mixture of MS documentation and technical knowledge is precisely what I'm looking for, and your answer fits the bill fine. Note that I've rolled back any edits you made to the question that diverged from the original question I was asking.
If the question is closed then so be it, but I'd rather not drastically change the core of what I'm asking just to ensure it remains open. If it does get closed, then I'll make a Meta thread for it, as I've seen questions with a similar format and am convinced that according to the Help Center it's on-topic. Add a comment. Active Oldest Votes. Displays or alters the encryption of directories [files] on NTFS partitions.
If this option is chosen, all other options are ignored. The directory specified can be anywhere in a local volume. If it is a mount point or points to a directory in another volume, the data on that volume will be removed. NTFS volumes only. It is recommended that you always encrypt both the file and the folder in which it resides, this prevents an encrypted file from becoming decrypted when it is modified. An administrator can add the contents of a.
Cipher cannot encrypt files that are marked as read-only.
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