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- [Instructor] There are several
hard drive specifications

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you should know for the exam
and one of those is capacity.

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The capacity of a drive
is the total amount

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of data that can be stored on that drive.

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Examples include 250
gigabytes, 500 gigabytes

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one terabyte, two terabytes,
four terabytes, and beyond.

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You want to be able to
find out what the capacity

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of your drive is and you
can do that in two ways.

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In Windows, first we can
go to "File Explorer"

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or "Windows Explorer" in
older versions of Windows

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and go to "This PC" and you'll
see your different volumes.

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That doesn't necessarily mean a drive

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because a drive can be broken
up into separate partitions

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or volumes, but here's one the G volume,

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which is a single drive.

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So we'll take a look at
that by right clicking on it

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and going to "Properties".

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And then we'll see here, the capacity,

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the total capacity for that
drive gives you a big number

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but it's essentially a 500 gig drive.

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There's a discrepancy there
and I'll talk about that

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in a moment but you wanna
be able to take a look

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and find out the basic
amount for the drive.

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This is considered to be a 500 gig drive.

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You also wanna be able
to read this little chart

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and see how much space is
used and how much is free.

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Now in a previous video I mentioned,

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I like to keep my drives 50% clear,

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and that's not always possible.

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As you can see here, I only
have about 80 gigs left

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on this particular drive 'cause
I'm recording so many videos

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but I will be clearing it out soon.

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And this is one of the
reasons you go and check.

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So you can tell the used space is blue,

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about 400 gig.

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Free space about 80 gig
and the total capacity

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for the drive.

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But you also want to be able to view this

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within disk management.

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And so if we bring up the "Run" prompt

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to get to disk management,
easy way to do it,

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go to "Run" and type
D-I-S-K-M-G-M-T dot M-S-C

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and that'll load up the
disk management tool.

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And this way you can see the
actual disks you can see,

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they're not really disks.

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These are all solid state drives

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but you can see the actual drives as well

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as the individual volumes.

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See, for example, disk zero,

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this drive is broken up
into multiple partitions.

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We've got the C drive, which
is, C volume I should say,

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which is 145 gig.

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And we've got the E
volume, which is 86 gig.

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And then we have our
recovery sections here,

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our recovery partitions.

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But that G volume that we saw,

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that's just inhabiting the entire drive,

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this other drive here,
which is a M.2 drive.

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And that's what we have here.

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We've got a solid state, S A T A 3.0

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and we've got a solid
state M.2 right here.

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So you wanna be able to
view that information,

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see the total size of these drives here

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and then break it down by
the partition or volume.

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And you can see those volumes here as well

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and see the percentage
free for each of these.

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So look at the C volume only 20% free

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and the G volume only 17% free.

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So I've got some work to do there

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and I've got a lot of backup to do.

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Backup stuff to my NAS box
and to archival as well.

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So you wanna be able to check those things

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within "File Explorer"
and "Disk Management".

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Now hard drive manufacturers go

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by the base 10 numbering system,

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meaning that there are
1,000 bytes in one kilobyte

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and here's the full name, kilobytes.

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One kilobyte, KB, has 1,000 bytes

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and this is technically
and mathematically correct.

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So if you look to purchase
a drive, it'll say,

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hey it's a 500 gigabyte
drive and you buy it.

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However it's measured differently

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in Windows and other operating systems.

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Programmatically and from an
operating system standpoint

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we use the base two system and the name

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actually changes here.

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Instead of a kilobyte what
we're dealing with is a kibibyte

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and that's K-I-B where there
is actually 1,024 bytes

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in this unit of measurement here.

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This kibibyte, which some
people may still call kilobytes.

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And the image on the right
shows an example of this,

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even though it does use
the base two system,

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Windows still refers
to these as kilobytes,

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megabytes, and gigabytes.

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And so you get a discrepancy here.

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Instead of this showing up as 500 gig,

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it shows up as 476 gig or
you might see it as 465 gig,

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it depends.

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So that's a little phenomenon.

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You're not losing any space.

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It's just how Windows
interprets it compared

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to what the hard drive calls it.

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Same amount of space though.

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And I actually have a video
that describes this phenomenon

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a bit further on my website
and this is the link for it.

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But for now you should
know how to find out

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the maximum capacity of a
volume or a drive in Windows.

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For example in "File Explorer"
and in "Disk Management"

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and be able to read and understand

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how much free space you have available.

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So a little bit about hard drive capacity.