- [Instructor] This short video will briefly discuss
the three types of hard drive cables listed
in this objective.
We discuss and demonstrate more
about these hard drives and cables and connections
in other videos within this course.
So real quick, three types here.
First, we have serial ATA, S A T A,
some people will call it SATA.
Some people will call it SATA, whichever way you go.
It's a very common hard drive technology that can work
with magnetic based drives or solid state drives.
And what we have here is the data cable.
This is a seven pin data connection.
It also uses a 15 pin power connection,
but this is a seven pin data connection.
And generally with these S A T A cables,
what you'll see is you'll have a straight connection
on one end, and an L or a 90 degree connection
on the other end.
So this moves the data
as much as 300 or 600 megabytes per second.
So very common.
Now, previous to this, and we're going back a ways,
is the integrated drive electronics, or IDE connection.
These are rare.
Chances are you're not gonna see much of these, if any,
but if you do it's probably
because you have some older drive
that you're trying to recover data from,
from an older system.
Now, this was back in the day, and this was used
for a long time, but this was back in the day
before everything moved over to serial bit streams,
where everything was, is now transferred
at one bit at a time.
Back then, it was parallel technology,
meaning eight bits at a time or 16 or 32.
And with this type of connection,
you'd be sending eight bits at a time in parallel.
So one byte of data at a time.
This is a IDE ribbon cable.
It's a 40 pin ribbon cable.
And generally the best speeds you'd get
from this would be 133 megahertz.
And with an eight bit connection to a hard drive,
that translates to 133 megabytes per second.
Now compare that to serial ATA,
which could do 300 or 600 megabytes per second.
Right?
So IDE you don't see this nearly as much anymore.
It's gonna be rare.
And generally these used the 16 bit bus,
but one single hard drive would work as an eight bit bus.
And again, 40 pin ribbon cable.
You would need some type of adapter to grab the data off
of a drive like this, an IDE drive,
and the right cabling or some type of add-on card
for a system that has an IDE connection.
And third here we have SCSI.
SCSI stands for small computer system interface.
And this has been used since the eighties.
Originally, this was also a parallel technology,
and it was designed to go faster than other technologies,
such as IDE, but now today,
SCSI has kind of moved over
to the serial side of things as well.
And an example of that is serial attached SCSI, or SAS.
And today with SAS, with serial attached SCSI,
you have different versions.
The latest version as of the recording of this video
came out in 2017, and that is SAS version four,
which could do as much as 22,
that's 22.5 gigabits per second.
22.5 gigabits per second.
So that's a very fast connection.
What do we use this for, SAS?
We'll use this for hard drive arrays, RAID systems,
network attached storage.
If you want really fast connections
and you wanna store a lot of data,
and you want it to be really robust
then serial attached SCSI is one version, one way to go.
And this is a 32 pin connector.
This is an SFF-8484 connector that you'll see sometimes.
So those are three types that you need to know for the exam.
You've got your SATA, very common for workstations
and for laptops.
You've got the older IDE, which you'll rarely see.
And then you've got SCSI, and one of the types
that you will see with servers and RAID arrays,
and network attached storage
is serial attached SCSI, SAS.