Hard Disks and File Systems Part 5
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Difficulty
Beginner
Video Transcription
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>> Hi, everybody. Welcome back to the course.
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In the last video, we talked about
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the different types of file systems.
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We talked about FAT,
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NTFS, and then also the Linux file systems.
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Extended file systems, so ext,
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ext2, ext3, and ext4.
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In this video, we're going talk about HFS
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and HFS Plus for Mac,
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but be very briefly.
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Then we'll also take a high-level overview
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of the different raid levels.
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Again, the raid levels are definitely
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something you'll want to know for the examination.
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HFS and HFS Plus,
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that's a hierarchical file system.
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The difference there, HFS uses 16-bit allocation blocks.
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HFS Plus uses a B-tree structure.
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Specifically for your exam,
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remember that HFS Plus uses a B-tree structure.
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Just in case it's tested on there,
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that was one of the more popular angles
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inside of the official [inaudible] counting material.
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Generally when they mentioned stuff multiple times,
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you usually see it on their examinations.
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RAID. We'll talk about
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what it means here in just a second.
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But we have different levels here as shown.
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We will talk about each one and what that means.
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RAID stands for redundant array,
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and it used to be of inexpensive disks.
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You might see it nowadays listed
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as Redundant Array of Independent Disks.
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It just depends on what you're
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looking at for a source and what is called.
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At the end of the day, it's still R-A-I-D,
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still smells RAID, so that's what we go.
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RAID 0. Some of the things with that one,
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it offers disk striping, but no redundancy.
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If one of them fails, we're done.
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Then it requires two drives minimum.
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RAID 1, it offered mirroring.
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The cool thing there, offers redundancy.
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If one of my disk fails,
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I've still got an exact copy
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on the other disk of my data,
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and so I can just keep going.
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Now, this one also has requirements
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or requires two drives minimum.
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We've also got RAID 2.
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This one here doesn't use
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any parity, mirroring, or striping.
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That's a little different than the other RAID levels.
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This one splits data at the bit level and
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then distributes that data to multiple disk.
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We have RAID 3,
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this one here uses byte level striping,
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then also a dedicated period disk.
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This one also stores checksums.
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This one is unable to cater to
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multiple data requests at the same time.
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That's one thing you'll definitely
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want to remember as well.
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We have RAID 5, which is
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uses a byte level data striping.
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It also requires three drives minimum.
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Again, as there is a minimum
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requirements here for the RAID,
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just make sure you memorize,
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like for example, RAID 5 has three drives minimum.
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This RAID level has this,
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this one has this, etc.
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Then we have RAID 10 or RAID 1 plus 0.
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This one actually combines,
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as the name implies, RAID 0 and RAID 1.
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So it combines the striping in the mirroring.
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It requires four drives minimum.
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That's one aspect of it is a little more expensive than
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other options and then
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the fault tolerance is actually similar to RAID 1.
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Then if two disks in the same mirrored pair fail,
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then the data is not going to be available.
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That's some common sense there,
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but it just in case you didn't know that.
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Just one quick post assessment question here.
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This type of RAID combines mirroring and striping.
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If you answered RAID 10 or if you
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screamed out at the computer,
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hey, it's RAID 1 plus 0,
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both of them we use interchangeably.
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RAID 10 in that list is the correct answer there.
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In this video, we talked about
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the different raid levels as well as just a brief
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overview of HFS and HFS Plus.
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In the next video, we're going to talk about
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things like file carving,
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how to analyze different image files,
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and then also the solution kit.
Up Next
Hard Disks and File Systems Part 6
Working with Windows and CLI Systems
Virtual Lab
Linux and Macintosh File Systems
Virtual Lab
Recovering Graphics Files Lab Part 1
Recovering Graphics Files Lab Part 2
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