Memory & Storage: Crash Course Computer Science #19

Memory & Storage: Crash Course Computer Science #19

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So we’ve talked about computer memory a couple times in this series, but what we haven’t talked about is storage. Data written to storage, like your hard drive, is a little different, because it will still be there even if the power goes out – this is known as non-volatile memory. Today we’re going to trace the history of these storage technologies from punch cards, delay line memory, core memory, magnetic tape, and magnetic drums, to floppy disks, hard disk drives, cds, and solid state drives. Initially, volatile memory, like RAM was much faster than these non-volatile storage memories, but that distinction is becoming less and less true today.

CORRECTION: AT 5:00 we say “around 9 kilobytes” when we should have said “kilobits”.

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50 Comments

  1. The American Fox on October 24, 2019 at 4:19 pm

    calls a ssd a hard drive



  2. The Summerlands on October 24, 2019 at 4:19 pm

    omg can’t watch bc you are extremely irritating



  3. Kumar Dua on October 24, 2019 at 4:21 pm

    Hi..Could you please tell me how do we technically explain transferring the data from one memory to another. Do we short the circuit between two points and the voltage becomes same at both points. Please advise…Thanks !



  4. Anonto Rocky on October 24, 2019 at 4:22 pm

    why do you guys have to speak so fast? sometimes its so hard to get you if someone is listening to the terms for the first time. Isn’t your videos for people who already doesn’t know the topic? you need some time to realize what you have heard and then move on to the next sentence….



  5. tamyboy1 on October 24, 2019 at 4:26 pm

    Great video!



  6. Adarsh Todi on October 24, 2019 at 4:31 pm

    goddess of explanation !!! ~wink wink~ (~.*)



  7. AquaWire on October 24, 2019 at 4:33 pm

    so the ram works to if i take off my computer the data gets saved for another time?

    sorry for my inglish 🙁



  8. Go Ahead on October 24, 2019 at 4:34 pm

    why are you talking so fast? IF Mr Donald Trump runs behind you?



  9. Deshant Devkota on October 24, 2019 at 4:34 pm

    Thanks



  10. Ammanuel on October 24, 2019 at 4:35 pm

    Fascinating! Really well done, thanks!!



  11. manicasion scar on October 24, 2019 at 4:37 pm

    Do you play minecraft I ask this question because there is a Minecraft creeper doll behind you



  12. Schpleef on October 24, 2019 at 4:39 pm

    I wanna know hoe hard drives store data



  13. Yohanan Lau on October 24, 2019 at 4:39 pm

    ఠ_ఠ🤔🤔🤔🤔🤔🤔



  14. motong low on October 24, 2019 at 4:40 pm

    50 bytes-y,521 bites 4$=80.4% 18Nb



  15. Martin Blondel on October 24, 2019 at 4:41 pm

    You are a very attractive young lady



  16. Unidorsal Icosahedron on October 24, 2019 at 4:41 pm

    11:00 Sure, the seek times may be slow by comparison, but the fastest consumer SSDs out there are about as fast in terms of bandwidth.



  17. Burhan Uddin on October 24, 2019 at 4:45 pm

    Madam! Plz guide about memory
    Basically two types of memory
    RAM and ROM ? So ROM is the fixed memory which means non changeable like as storage means harddisk etc so you were asking that memory is the temporary but ROM is permanent and it is also part of memory?



  18. Phenochs Mundala on October 24, 2019 at 4:45 pm

    To think, I have a 5 terabyte external hard drive the size of my palm!



  19. Rob Law on October 24, 2019 at 4:45 pm

    Great video. Thanks for posting!



  20. Little Gamer on October 24, 2019 at 4:48 pm

    _Crash Course_ for *Computer Programming*



  21. santarsingh rawat on October 24, 2019 at 4:48 pm

    Hi



  22. Syed Osama Ali Shah on October 24, 2019 at 4:48 pm

    I have a question . Why there are so many short terms memories available ? Why not only one ? Why so many like Ragisters , Cache and Ram . Need your help and waiting for your reply 🙄



  23. Jodi Fleisig on October 24, 2019 at 4:50 pm

    This was really good.. but anyone like me listening to this is a newbie and you speak TOOOOO fast and it’s hard to follow. As a television executive, my advice would be to SLOW down so we can follow your information. The content is excellent, but not if we can’t understand it. Thanks so much~



  24. FujoshiPeanut on October 24, 2019 at 4:52 pm

    I remember trying to save word docs with loads of clip art on a floppy disk but was so confused as to why I could never save even one document while my mum was able to save lots of word docs with no pictures 😂 Eventually it clicked



  25. Donnie Darko on October 24, 2019 at 4:54 pm

    Currently studying computer science. This blows my mind!



  26. Alex Molyneux on October 24, 2019 at 4:54 pm

    so do solid state drives work in the same way as RAM? How do they work?



  27. Ravi Kumar on October 24, 2019 at 4:55 pm

    Plz speak slowly….



  28. Giraffinator on October 24, 2019 at 4:56 pm

    I feel superior to others for having a childhood that coincided with the tail-end of the floppy disk lifetime.



  29. Sakibul islam on October 24, 2019 at 4:57 pm

    but how this SSD work. how these disks are non-volatile?



  30. daniel jebadoss on October 24, 2019 at 4:59 pm

    Very useful



  31. 00 Buck on October 24, 2019 at 4:59 pm

    Very good presentation



  32. Spicy Cat on October 24, 2019 at 5:00 pm

    People can know about things after they’re stopped being produced



  33. FraznoFire on October 24, 2019 at 5:00 pm

    "9216 bits, which is about 9 kilobytes" wouldn’t it be kilobits? because 9216 bits is more around 1 kilobyte



  34. Tom McMorrow on October 24, 2019 at 5:02 pm

    I have to mirror many fellow commenters in saying boy I feel old. I remember as a sophomore in high school back in 2004 and I was the first person to get a 256 MB flash drive (for $50!). I was the ‘big man on campus’ because of it (or at least in my geeky circle of friends). I think part of what makes us (late 20’s, early 30’s) feel so old is that we grew up right through the technological explosion.



  35. Joanne Belen on October 24, 2019 at 5:04 pm

    its look like your in a hurry,, you talk very fast,, can you please speak a little slow



  36. delve on October 24, 2019 at 5:04 pm

    10:35
    I can’t believe you’ve done this.



  37. Bilal Abbaci on October 24, 2019 at 5:05 pm

    Can we have short notes on that?



  38. Iván on October 24, 2019 at 5:07 pm

    Really good memory hierarchy pyramid chart 8:53



  39. Joanne Msk on October 24, 2019 at 5:08 pm

    Please, we really need Russian subtitles!🙏🙏🙏



  40. Phillip Ward on October 24, 2019 at 5:09 pm

    Now I feel ancient. i remember floppys like yesterday



  41. Jonathan Rys on October 24, 2019 at 5:09 pm

    Damn, I totally have some old floppy disks and I need coasters.



  42. Mega Nate on October 24, 2019 at 5:10 pm

    I came here hoping I would learn how modern ram works not a crash course on its history



  43. Keshav Nair on October 24, 2019 at 5:12 pm

    Please go a bit slow



  44. Nontsomikazi March on October 24, 2019 at 5:14 pm

    paper punch cards and his cousin hahaha



  45. Bilal Abbaci on October 24, 2019 at 5:15 pm

    0:55 Only come here for this!



  46. Susan on October 24, 2019 at 5:16 pm

    4:59 You state that 9216 BITS is equal to about 9 kiloBYTES. But there’s 8 bits to a byte, so this statement is incorrect.



  47. Joyson Wildhart on October 24, 2019 at 5:17 pm

    note to self: do not invest in ram



  48. Alexandr Padalka on October 24, 2019 at 5:18 pm

    🗽🗽



  49. Anonymous on October 24, 2019 at 5:18 pm

    First learn how to speak slowly.



  50. Kamil Dawood on October 24, 2019 at 5:18 pm

    Wow! This video is very educational and explained amazingly well!.. there were other information i dint find in other videos about history of memory but found in yours.. Thanks a lot!!