Here are instructions to help you run MHDD:
Before running this test it would be a good idea to backup any data that you cannot afford to lose. This test uses the hard drive at 100%. If the drive is failing or has problems it is possible for the drive to fail suddenly especially during heavy use as this test will do. It is unlikely but still I recommend backing files up to be safe.
Here are the instructions to run the test:
The first step will be to burn MHDD to a disc as an image (cd preferably) or create a bootable flash drive from the iso.
After burning the disc/flash drive, restart the laptop and start tapping f2 right away to get into the bios. There you should see System Configuration, expand that by clicking the + button. In that list there should be something called Sata operation. (Sata Operation may also be by itself in that first screen list)
Click on sata operation and take note of the current setting to the right it will probably be set to AHCI it will need to be switched back to this after MHDD is done running. Select ATA, ide, or compatibility mode and then click apply. Save and exit the bios, or if apply was the only option you can use Ctrl+Alt+Delete to restart.
Now with the burned disc/flash drive in the computer, after a restart, start tapping F12 on the keyboard. This will bring up the boot options menu. Select cd/dvd/cd-rw drive or bootable flash (if you went this way) and hit enter.
If this worked correctly and booted to mhdd you should see a screen that says Microsoft windows 98 startup menu. You can let the timer run out or just hit enter on option (2 . Start computer without SCSI support) in that menu .
Now you should see a screen with numbers, most of these will not have any device listed behind them but one number should for example on my dell computer number 6 has WDC WD1600BEVT-75A23T0… and at the end a number in white which is the size of the drive 312,581,808.
If this is the correct drive, on the keyboard type the number in front of the drive (in my case it was 6) and then hit enter.
Now you should have a screen with MHDD> and a blinking cursor.
Now hit F4 on the keyboard 2 times and this will start scanning the hard drive. (if you want to enable turning off bad blocks let me know for now just scan)
You should be able to see the computer start scanning, each block represents one sector on the hard drive. What we are looking for will show up on the right side of the screen.
There is a list on the right which shows numbers:
Anything below the <150ms is a slow sector or a problem sector. Slow sectors <500 or >500 will slow down the computer. If there are a lot of these the drive should be replaced. Even new drives have around 3-4 slow sectors so if it has no more than 10 I would say the drive is ok.
Also if you have any at the end that were marked as UNC this means the drive has uncorrectable errors and the hard drive should probably be replaced.
If all of the sectors were ok and fell within the range of:
Then the hard drive is ok, if there are only a few (no more than 10 sectors that are slow <500 or >500) the hard drive should be ok to use.
NOTE: that if there are many slow sectors one after another or you start having error after error the drive is in bad shape and I recommend ending the test. To end the test hit the Esc key.
After you are done testing you will need to go back into the bios by restarting the computer and tapping f2. Go back to Sata Operation and change it back to the default which probably was AHCI.
Then restart and the computer should boot again.
(If you are getting a blue screen and the computer restarts go back into the bios and confirm that Sata Operation is set to what it was before changing it to ATA).