Hard Disks and File Systems Part 1

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17 hours 41 minutes
Video Transcription
Hey, everybody, welcome back to the course. So the last video we wrapped up our discussion on the different faces of investigation in module two.
So here in Montreuil three, we're gonna go over some generalized information about hard disk and file systems. So in this video, we're going to start talking about the different components that make up a hard disk.
So a quick pre assessment question, what is S s d stand for? And we'll learn that in this video
***. If you guess solid state drive, you are correct. That's what it stands for. The other ones air. Ah, pretty obvious that they're made of
so hard. Disk driver h d d. This uses magnetic storage to storm retrieve data. It's also not involved foul storage because of the magnetic aspect of it. So some components of it are platters, tracks, sectors and clusters. We'll talk about those a little bit.
Players are gonna be the circular metal disk that are mounted in the drive enclosure. Something important for the exam you want to remember is that there's two heads per platter, so just keep that in mind just in case you see some questions on platters for the exam
tracks s Oh, this is gonna be that concentric ring on a platter s. We've got a little image there. No, uh, for the ch ef I examination, you're not gonna be questioned as faras. Like, what's the difference between geometrical and a geometrical sector? Excuse me and attract sector. It's just gonna be basically like a track, right? It's gonna be,
um, listed as a tracker track sister
So these contain disc blocks.
Um, and, uh, they store data, and this numbering is 0 to 1023. So that's something else you'll just want to keep in mind. Measure studying for the siege. If I exam
sectors, we're gonna be the smallest physical storage on the hard disk platter s O. These are 512 bytes long now 512 bytes. You'll also notice that's a master boot record. A cz. Well, eh, So just keep that in mind. You might see the number on the on the exam tested in some capacity.
So we also have things like bad sectors. So another topic that's in the official EEC counsel material that might be on the exam. So basically, this is As it sounds right, it's portions of the disc that are unusable could be due to flaws. Generally, it's caused by a configuration issues and could also be caused by the physical disturbance to the actual days.
The master boot record. As I mentioned, 512 bytes, that last portion is very important there. That's the signature. So that zero x a 55 You'll definitely want to memorize that, just in case you see something about it on the actual examination itself.
Clusters, we kind of mentioned these were the smallest accessible, logical storage units on the hard disk drive now. So these air formed by combining different sectors together,
Slacks based. So basically, as the name implies, it's a wasted area, you know? So think of like that slacker person right there kind of a waste of, you know of, you know, the human body, right? They don't really do anything. They sit on the couch all day, that sort of stuff. So similar thing here in that aspect of it's a wasted area of the disc clusters. So basically,
you know, we've got small files or we're using small files
and the from the end of that file to the end of the cluster. That's gonna be the slack space, right? That's that wasted space.
So SST or solid state drives, which is more common, or or at least in certain devices of more common thing that you see nowadays.
So these have some advantages, right? So higher data transfer rates, the heiress area storage on them the storage ability, reliability. They're also not volatile, but they come with a price, right? They cost a little more than hdgs.
Her disk interfaces. Eso
you probably Realistically, you probably won't see this on the ch if I examine, it is mentioned in the material. But I doubt, you know, just cause this is kind of somewhat older stuff my doubt that you would honestly see that on the real exam. But again, you could s Oh, it's good to notice what these are for you Not familiar?
This is more along the lines of kind of like a plus type of knowledge.
Well, you're sat at your pad, uh, and then off course, your scuzzy as well.
So just a quick post assessment question here, So true or false here that the NPR or the master boot record that it's 512 bytes. So is that true or false?
All right, so that's true. You got that? Correct. If you guess true, eso again yields. That's something that you'll just want to memorize as you're studying for the ch EF Eye examination.
So in this video, we just went over some of the components of a hard disk. We also talked about SST and what that was, or solid state drives. So remember the pre assessment question was regarding what does SST stand for?
And the next video we're gonna go over some things, like bit versus bike versus Nibble A. Cz Well, some other topics that are related and again in this entire module, we're kind of just going over the structure off hard disk as well as file system. So a lot of ah memorization, if you will
on these particular things that you'll need to know. But just make sure you understand them
that way. As you see the terminology on the examination, you'll understand. For example, if you if you if they tested you on like master boot record, you would know that that's 512 bytes and you would know that NBR stands for master Boot Records. So just keep all that in mind. This is kind of like foundational knowledge
that you'll need to know. I'm never want for a career forensics, but also more so towards a ch EF eye examination.
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