Deleted Files on SSD Drives Aren’t Really Gone

Deleted Files on SSD Drives Aren’t Really Gone

Professor Derek McAuley (Computer Science at the University of Nottingham) explains why deleted files on SSD and Flash drives may not really be gone – even when overwritten.

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22 thoughts on “Deleted Files on SSD Drives Aren’t Really Gone

  1. I more than agree with Mr. Brady. Not all ideas are best presented in video format, and the increasing tendency of so many people to do so has become one of my pet peeves. It’s my main gripe about CNET these days and even more about sites such as Upworthy. Just tell me what I need to know; don’t spend an hour beating around the bush.

    I am from the era when people knew how to read and write; I can get the information I need in just a few seconds by using that intellectual tool called “reading” as opposed to having to spend an eternity downloading a video and then watching it. I have AT&T’s molasses tier DSL, so streaming doesn’t work very well. It’s also a heck of a lot easier to move one’s eyes up to a previous paragraph to re-read it than it is to back up a video.

    This particular video is even more of an annoyance to me since I find it quite difficult to cope with the accent. I tried, but I gave up trying to translate it into American English; I’m sure I’ll find an explication of his thesis and explanation somewhere in a written format, one that will only take a short while to peruse and understand.

  2. Video Title said Deleted Files on SSD Drives Aren’t Really Gone but Email Title of PC PC Pitstop said Why Deleted Files May Not Really Be Gone – Even When Overwritten
    1st confusion and an 8 minute video is not what I want to do while a screen shot of PowerPoint slides or a PDF indexed document would be the way to go. my view / cheers

  3. (6:22) "Now this has actually been used by people to recover information from hard drives"

    I call bullsh*t… show one real world example of this ever being done by anyone.

    • @Djb Twcny:

      I don’t know why you call bullsh*t, unless I misunderstand your meaning. Recovering erased files is done hundreds of times every day for businesses that have had important files inadvertently or accidentally deleted. Look in the telephone directly of any larger city and you will find companies offering this service.

      • @Mark Anthony: Again, bullsh*t. Show me one single company anywhere in the world that even claims the ability (nevermind actually having done it) to recover files from a magnetic platter HDD that have been over-written. Not just “erased” but over-written (even just one time)… as discussed in the video at 6:22.

    • @Norbert (Bob) Gostischa: I bet you have commented on a politician you didn’t vote for, or a product you didn’t buy. If you were referring to Dave Brady’s post, he DOES make sense. He was not commenting on this video, but on all instructional or informational videos. Without such constructive critisism videos or products would not get improved much. He was letting the editors know why he wouldn’t watch their videos. And I totally agree with him.

  4. Great video – loved the details. Professor McCauley clearly knows his stuff, and I really appreciate hearing from someone who has a depth of understanding of the topic and is able to communicate it clearly. Keep bringing it!!

  5. Food for thought – and my apologies to Professor McCauley because this is a genera; response to informational videos, not this one in particular.

    Even though I had an interest in the subject matter, I didn't watch this video, because I don't want to spend the time waiting to get to the info I need. Consider this:
    1) I may already know information being presented, but won't know without watching the entire video.
    2) Parts of the video may be of no value/interest to me, but I can't really skip them because I don't know where to stop the fast forward.
    3) I often encounter these videos at work, and don't want to disturb my staff or customers with the sound – and earphones aren't appropriate.

    I almost never watch instructable or informational videos, because they take up way too much time and dedicated attention.

    Written instructables, on the other hand, allow me to
    1) skip the parts I don't need/aren't interested in, and
    2) comfortably stop, and come back even the next day or week to finish up!
    I can also print the information for use at a later time–when my computer is off or I'm away from my desk/laptop/tablet/phone.

    Videos work well for lots of things, but in my opinion, they aren't suitable to presenting information or instructions.

    Thanks for listening!

      • I agree 100%. I fly a lot and often sit in an airport or aircraft and either read from my laptop or from notes. The video is of little use at these times because of the interuptions and distractions.

    • @Dave Brady: I also agree. I find written articles much more convenient. I will tend to open up several tabs with links that I want to look at and then work through them at my convenience. If it turns out to be a video presentation of this nature I will more often just close the tab straight away without watching it. I prefer to read this kind of thing, not watch someone talking about it.

    • @Dave Brady:
      Dave, there are many people who can understand visual instructions much better than reading. We are all different on how we process our information.
      Also, there are instructions that has to be demonstrated with visual and sound, that can not be fully shown on paper.
      By the way, if you are reading an instruction information booklet, do you go through it first and see what there is you already know, or are you looking for just the things you do not know ?
      So I ask you and Bob Price both Did you watch this, or just wasting your time reading and writing some worthless jumbo for others of us to read.

    • @Dave Brady: How interesting considering your choice of not watching the video. I am reminded of how many of the male gender also choose not to read instructions when it comes to many things loading programs, reformatting or building. They know, they got it … until in the end they discover they really didn’t get it at all. However, I am sure this is not the case for you.
      Considering the market place particularly here, this is viewed by many, all are at a different state of ability and or know how / learning. I am surprised if time is of such value, that you took the time to express how much you devalue a video that others may find informative and one you didn’t watch. Again no disrespect, yet reading comments of an un watched video is equally as much a waste of time reading. Thanks, though as I was encouraged to watch the video if for no more than just to see what you missed. Thanks Professor McAuley for taking the time and effort to inform some of us. Saving video or link to watch at a later time is as simple as saving anything else. You may also pause and manually forward the video. Thankfully I am a female and able to multitask not to mention I appreciate this site does not just cater to ME or what I want, but to many.

      As you expressed,
      Thanks for listening!

      • @Barb Eaton: Well, doggone it, Barb! So much time has gone by! I wish I had seen your response earlier, but hopefully I can clear up a couple of things.
        1. I was interested in the subject matter, but didn’t feel comfortable watching a nearly-9-minute video at my work place, especially if it’s info I can get elsewhere by reading in just a few minutes. Granted I am a rapid reader–and have found that I can skim a written article and slow down for the parts with meat in them. Can’t do that with a video!
        2. Some info sites similar to PCPitStop have instructional videos, but also include a written transcript. Bet you can’t guess which one I go for!
        3. In direct response to your comments, I’m surprised you didn’t accuse me of having an overdose of testosterone or something! Here I was, making an innocent attempt to provide helpful information, and you accuse me of performing at the level of a stereotype! Don’t know where that came from, and sorry you feel that way about half of the human race.
        4. FYI, I nearly always read instructions before starting a project. I find it saves a lot of time in the long run. For instance, if I purchase a new program or an upgrade, the manuals/instructions always spend a while in the bathroom and/or by my bed before the computer gets upgraded! Same thing with tools, new cars (tell me – did you ever read the manual that comes with your car? I did! As well as my wife’s car, the lawnmower, the chain saw, the electric mixer (yes, I cook) and so on.)
        5. I didn’t “devalue” the video; not once did I say it was below par or expectation. I couldn’t, since I didn’t see it. I was simply attempting to provide input to PCPitstop, in the hopes that they could come up with something that would meet my needs as well as the needs of people who prefer to watch videos.
        6. Finally, need I say it…How about them Yankees!

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