Troubleshooting Hard Drives and RAID Arrays (part 2)

Video Activity

Troubleshooting Hard Drives and RAID Arrays (part 2) Now we'll examine issues and common issues with RAID disk and why they occur. You'll learn how incorrect settings or poor cabling may cause a RAID not to be found or to stop working, and what you need to do to resolve that. You'll learn about the CMOS battery that lives on the motherboard, and ho...

Join over 3 million cybersecurity professionals advancing their career
Sign up with

Already have an account? Sign In »

5 hours 33 minutes
Video Description

Troubleshooting Hard Drives and RAID Arrays (part 2) Now we'll examine issues and common issues with RAID disk and why they occur. You'll learn how incorrect settings or poor cabling may cause a RAID not to be found or to stop working, and what you need to do to resolve that. You'll learn about the CMOS battery that lives on the motherboard, and how its failure can trigger a BIOS reset or what happens when the RAID Controller or driver fails and how to correct troubleshoot those events. We'll discuss in detail some of the tasks and diagnostic utilities that will help you troubleshoot and repair hard drive issues such as CHKDSK. After completing this lesson you know when to use a given task and utility, how to correctly use them, as well as the advantages and limitations and how to work around them.

Video Transcription
Now let's talk a little bit about issues we may have with our raid systems When we're trying Thio, we're trying to use our computer. We're trying. We're countering issues with Raid. We talked about how we talked about it earlier. Modules have Our raid is stands for redundant array of of independent discs. And these are different disks that we can set up
to perform features such as striping or mere ing or parody
in order to help back up or speed up. Our disks were reading writing data. So let's take a look at some of the issues we may encounter Some of the common symptoms we may have.
One of the common symptoms we may have is Raid not found on that maybe because of some bad bios settings that we have to not recognize rate or we may have a missing raid drive. So we need to check those settings. We need thio, check our bios and go in and make sure that we have that enabled we have our drives turned on
and that we aren't missing an actual drive in our computer or we're not. We don't have any incorrect cabling in our computer
and then we met also may have the situation where our raid stops working. This also may be a result of bad bios settings. Maybe we configured our bios toe work properly with Raid, and then our sea moss battery died. Those settings reset, and now our raids stop working because of that,
may also have a bad raid controller or raid driver.
So we need to check both our controllers and our drivers for a raid structure in order to make sure that it's not our if it's not our bios, and then it may be our controllers or drivers for a raid. So we need to make sure that we're checking all of these different components so that our raid system will continue to work
and that will be able to use it
in order to provide the additional functionality of having the speeding up there are striping or using our striping and smearing with striping or parody. Now that we have an idea of what some of the different symptoms are that we may see when we're having issues with our drives, what these different symptoms may mean,
let's take a look at some of the tools that we can use in order to diagnose our hard drives
or help to recover from some issues that we may encounter. Now one of our first tools is a screwdriver. Now, as a PC technician, as someone who's going to start working on computers is good to have a good tool kit. Ah, good
screwdriver kit that has different sizes and different shapes of screw of heads on it.
That way we can access different different components of the computer. We can open different devices that may have anything from a Phillips head to a flat head to even a hex shaped hex. Shape it or like a star, ah, star shaped head. So we want to make sure that we have the different tools we need.
We want it, we may want to invest in. This is a very small version of a kit,
but we may wanna invest in some sort of kit that has different type of screwdrivers and different, different other tools, such as tweezers, or
are what we can see. Cole grabbers and even our chip or movers are chip places as well. But these these different kits, of course, are going to come in handy for a lot of different purposes. When were you working with hard drives? Because if our hard drives in a laptop, we may need to unscrew a cover or a plate in order to get to the hard drive.
We may have a hard drive screwed into a set of rails, so we want to be able to unscrew the hard drive from those rails to gain access to it.
So it's good to have our screwdriver kit handy and it's good toe. Have it in our tool bag when we're going to check out a computer.
Now, our next to here is gonna be an external enclosure.
Now what an external enclosure does we have an example of one here and external enclosure actually allows us to take a hard drive out of a computer,
place it in a enclosure and then connect it back up to a computer through a different means, such as U. S. B port or FireWire port, et cetera. Now, how why is this handy? Why would we want to be able to use this well, say we have a hard drive that's starting to fail
or say we have a hard drive that isn't being recognized properly on a computer.
We can take that hard drive. We can plug it. We can put it into an enclosure and then using that enclosure connecting enclosure to our computer and start reading data off of it. Or see if we can recover any data. The enclosure will allow us to connect the hard drive to a to a
technical or a troubleshooting computer. Ah, computer that has specialized tools on it for data recovery. Or if you know we have a drive that completely fails, we can put a draw our hard drive in the enclosure,
and we can possibly do some
enhanced or some really in depth recovery on it. So we have our hard drive. And as I've been talking, I've been undoing our enclosure here and we can see how we have our hard drive and it's just connected up with Arcee two cables.
so go ahead and unhook. We have our hard drive with our Seder connectors, and then we have our enclosure here. We could swap out our hard drive, which, with whichever hard drive we want.
Then after we select our hard drive, take the hard drive out of the computer, if necessary. We just place it inside our enclosure.
We reconnect our power cable.
this particular enclosure has two power cables. It has a state of power cable, and it also has a Molex power cable.
Just in case we are using that type of Dr
and we connect both of our both our data and our power cable.
We talk any additional cables to the side so they don't get in the way.
And then much like we disassembled,
we'll just go ahead and we'll reassemble.
Now, once we have successfully,
reassemble our enclosure,
we can
put Arkan closure back together with our clamps and then re screw in our face plate on the back. And then what will be able to do is we'll be able to connect into this enclosure, turn it on, amounted to our computer and be able to navigate through and see if we can recover some data.
Our next tool is going to be a digital tools. Not gonna be a physical tool like a screwdriver or an external enclosure are next tool is going to be the cheque disk utility Now check disc or C H K D S K is going to be a command that we can run from. We can run from command line coming from C M D. Or we can run
as part of a
pre boots
or recovery utility so we can run a wimpy disc in order to boot our computer to a wimpy environment. Or we can run a recovery, our recovery disc or we can just run. Our operating system is normal and we can run. This utility
check disc also has a graphical user interface. Rather than having to do everything by command line,
we can pull up the graphical user interface and just select our check boxes and our drop down menus and apply buttons and etcetera are checked disc. Essentially, what it does is it allows us to scan and attempt to fix a disc, particularly the bad sectors on a disk.
It'll see if it finds any bad sectors. See if there's any data written to those bad sectors
and, if possible, attempts to try to fix and recover the data that was on those bad sectors. Now check. This could be handy for you noticed that we're having some data that may be corrupted or if we have data on our drive that possibly is related to our operating system files, and we're having some blue screen issues. So we want to try and
run a check disk on our computer to check that disc and see if there's any issues that it can detect and possibly fix.
Now, in order to run our check disk on a disc, that this cannot be one that is in the in use operating system. If we have our operating system installed on our disk on one particular hard drive and then we have a second our drive in our computer, we can run the hard drive on that second computer and check that disk.
But if we are trying to check our hard disk that are operating system is running on,
we may need to actually scheduled check disc to run at next boot or when we weaken boot into recovery options and then select check disk and then run the check disk on our hard disk and check for those bad sectors.
Sometimes when we boot our computer, we may notice it's it lets us know
that it recommends that we run check this because there may be some bad sectors. Maybe there was an improper shut down. Or maybe it detects that there's some issues going on with our hard disk so we can let it run. Check discord. We can select the exit and then see if it will automatically fixing the issues for us.
Some more digital tools that we have. We have format. The format formatting error disc allows us to essentially create a file system on that disk so that we can use it to save data. If we have a disc that currently has data on it and we form at the disc,
this will make the disc appear blank for us again will be brand new over. Be empty.
Don't confuse this with a secure wipe. Just formatting Our disk will not securely wipe the data off of it. There are recovering tools that can be used to try to dig some of that data back up. But at the same time, if you are going to format a disc,
don't format a disc unless you are completely okay with losing the data on that disk.
Yes, I know. I just said that we can use recovery tools and pull the data back. But that data may be fragmented. Up, it may be, may be corrupted, and we only recover certain areas of the data. Or we may have to spend a lot of money in order to recover the data so
formatting a disk do not format unless you are okay with losing the date of this on that disk.
But at the same time, understand that formatting and disc doesn't securely wipe the data that we have on there. We can. We want a format. When we form at the disc, Will Shoot will select a file system that we want the format with, and when we select, our file system will select a standard format or a quick format. Now, if we're running a quick format,
what that does is it simply uses the existing existing file system tables. It just clears them out, and it re uses our disk. As is.
It doesn't check and see if there's any bad sectors that it needs to avoid. If we run a full normal format, then it will actually go through our entire disc. It'll check all the sectors and then it'll see if there's any bad sectors it needs to avoid when it's using its file system. So if we have a new disk that we have that we've never used before,
or if we have a disc that was acting up or had some problems with the operating systems or reformatting it,
it's best to use that normal format rather than the quick format.
And then, lastly, we have our file recovery software. If we do have a disc that went bad or if we have a disc that the operating system corrupted on it, or if we have some corrupted files on a disk that we're trying to pull back,
we can use file recovery software as a means to try and recover some of this information. Just because we deleted certain file doesn't mean it's gone. That file may still be there. It just doesn't have the pointers to the file anymore. So you can run if we can run a file recovery software and try to pull that data back. Different
strengths of different file recovery Softwares are available.
They they do. They may cost money, though I may find some free utilities, but sometimes the paid utilities will do a little bit deeper looking or we'll run some more intensive scans. Don't assume, however, that a file recovery software will get everything if data is corrupted.
Ah, and it pulls the data back, it may not be readable. What may not be usable because the date has been corrupted
and been overwritten with other information
so we can use we want to add this to our tool bag. If we're in a business or enterprise environment, we may want tohave our. We want to try to ask our management to see if they can invest in some file recovery software, or at least one or two licenses to
have available in case we need to ever run into a situation where we need to take a disc
and try to run file recovery software on it.
So thank you for joining us here today on cyberia dot i t. We talked about troubleshooting hard drive and raid array issues. We talked about everything from operating system, not found error to our drive, not booting properly to drive. Sounds like clicking Sze to raid issues as well.
And then we took a look at some of our tools and how we can use them like our screwdrivers, and are driving closures and are
digital tools like our check disc and our format command. So hopefully we'll be able to take some of this information and you'll be able to apply it. When you're trying to troubleshoot different hard drive issues you may run into, and hopefully we'll see you here next time on cyber readout, I t.
Up Next
Troubleshoot Critical Systems

Diagnosing system malfunctions and finding a solution is an important skill for help desk professionals to develop. Expand your knowledge of the troubleshooting theory in less than an hour.

Instructed By