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10 Ways to Fix Non System Disk or Disk Error on Laptops/PC

How do you fix a non-system disk or disk error on HP, Dell, Compaq, Acer, Lenovo PCs or laptops? Besides some basic troubleshooting methods, this page focuses on how to use third-party bootable media data recovery software and bootable media partition manager software to solve the non-system disk or disk error without losing data.

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Table of Contents

change boot order

If the "Non system disk or disk error" error message is showing up because your Hard Disk Drive's boot files have become damaged or corrupt, removing all the non-bootable storage devices, checking on your HDD's IDE or SATA cable, or setting the right boot priority in BIOS/UEFI should fix the issue.

Learn more items...

Don't worry if you are having a "Non-System Disk or Disk" error on HP, Dell, Compaq, Acer, Lenovo, etc. laptops and computers. In the following, you will find 10 fixes for general troubleshooting and advanced troubleshooting of this issue. Pick up the best solution to remove this error and make your computer work again.

Workable Solutions Step-by-step Troubleshooting
5 General Troubleshooting Fixes

Fix 1. Remove non-bootable storage devices...Full steps

Fix 2. Check HDD IDE and SATA cable...Full steps

More Fixes...Full steps

5 Advanced Troubleshooting Fixes

Fix 5. Recover data from hard drive without OS...Full steps

Fix 6. Rebuild MBR to fix non-system disk error...Full steps

More Fixes...Full steps

About non-system disk or disk error

"What does it mean when your computer says non-system disk or disk error? It's an HP Compaq 6000 that runs trouble when I start it, a message comes up displaying as Non-system disk error or disks error, replace and strike any key when ready."

non system disk or disk error

For your information, the non-system disk or disk error message might appear when the computer BIOS cannot find a bootable operating system on any of the storage devices included in its boot path, or it fails to locate the boot disk. Similar error messages include boot device not found, operating system not found or missing operating system...

General troubleshooting for non-system disk or disk error

According to HP's help page, a very detailed guide is offered for HP notebook PCs to work out the "Non-system disk error" as well as "disk error" that appears on a black screen in Windows 10, 7 and Vista. In fact, the given suggestions are also applicable to other desktops and laptops, such as Dell, Compaq, Acer, Lenovo, etc.

In conclusion, you can try at first the four basic approaches, which usually helps fix the setup and stop error during Windows installation or startup.

Fix 1. Remove all the non-bootable storage devices

What storage drives are currently connected to your computer? Check and try to remove all the non-bootable storage devices, namely non-system drives, that make the computer have trouble to boot from, including a floppy disk or CD/DVD disc. After the safe ejection, try to turn off and on the computer and see if the error persists on.

Fix 2. Check on your HDD's IDE or SATA cable

Check on your HDD's IDE or SATA cable and make sure that the cable connecting the HDD to the motherboard is fastened securely and restart your computer.

Fix 3. Set the right boot priority in BIOS/UEFI

Access to your computer's BIOS/UEFI environment and make sure that the hard disk drive you're trying to boot from is in the right boot order settings, which should be at the very top of the boot order list. To change the boot order, you can do it like this:

  • Press the key required to enter the BIOS or UEFI setup screen (Usually Esc, F2, F8, F10) while computer restarting.
  • In BIOS, use the arrow keys on the keyboard to select the Boot tab and give the system drive the boot priority, which should be placed on the top.
  • In UEFI, you can use the mouse pointer to specify the boot sequence.
  • Save and exit the BIOS/UEFI setup utility. The computer will restart with the changed settings.

change boot order to fix non system disk or disk error

Fix 4. Remove and reinstall the hard drive

A bad connection between the hard drive and the computer would also expose such unbootable issues, and most of the time it's because the hard drive was once dropped or jarred. To fix the connection problem, you must do it in a safe way by following the standard process offered here.

  • Cut off the power
  • Take out the battery (For laptops only)
  • Remove the system disk (HDD or SSD)
  • Reinstall the system disk
  • Reinstall the battery (For laptops only)
  • Power on the computer

Fix 5. Use Windows repair services

The above solutions are not easy for ordinary users. If you want to solve the problem in a safe way, you can use manual Windows data recovery services. EaseUS professional technical team can help you solve any system startup errors, including system failure, system blue screen, system black screen, and so on.

Consult with EaseUS data recovery experts for one-on-one manual recovery service. We could offer the following services after FREE diagnosis:

  • Fix Windows boot issues, including BSOD
  • Fix Windows error and configure Windows environment
  • Restore the system when it fails to boot
  • Optimize Windows computer to make it run quickly

Advanced troubleshooting for non-system disk or disk error

Excluding the outside factors that caused the non-system disk or disk error, you have to accept the facts that something went wrong with the hard disk drive's boot files, which might become damaged or corrupted, and usually repairing the HDD's boot sector, master boot record (MBR) and boot configuration data (BCD) should take effect.

What's more, to protect data on a non-bootable computer, you're strongly suggested to take the right steps to fix the issue wisely.

First of all, download EaseUS Data Recovery Wizard to access and recover hard drive data without OS.

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Later, download EaseUS bootable partition manager to rebuild MBR.

Another healthy computer without boot problems and a CD/DVD disc/USB drive are required by both bootable software in order to create a bootable storage media. It's necessary to recover data from a computer or hard drive that won't boot, and manage partitions such as partition, format, or wipe partition without OS as well as fix hard drive corruption, bad sectors and rebuild MBR.

Fix 6. Access hard drive and recover data from the hard disk without OS

Step 1. Create a bootable disk

Launch EaseUS Data Recovery Wizard, choose "Crashed PC Recovery" and click "Go to Recover".

choose crashed pc recovery

Select an empty USB to create the bootable drive and click "Create".

Warning: When you create a bootable disk, EaseUS Data Recovery Wizard will erase all data saved in the USB drive. Back up important data beforehand. 

create bootable USB

Step 2. Boot your computer from the bootable USB

Connect the bootable disk to the PC that won't boot and change your computer boot sequence in BIOS. For most users, it works well when they restart their computer and press F2 simultaneously to enter BIOS.

Set to boot the PC from "Removable Devices" (bootable USB disk) beyond Hard Drive. Press "F10" to save and exit.

restart from bootable USB

Step 3. Recover data from a crashed system/PC

After booting from EaseUS Data Recovery Wizard bootable disk, select the drive you want to scan to find all your lost files. Preview and recover the files you need to a safe location.

recover lost files

Fix 7. Fix non-system disk or disk error by rebuilding MBR

Download and install EaseUS Partition Master Professional on a normal computer.

Step 1. Create a WinPE bootable disk

  • Launch EaseUS Partition Master, and click "Bootable Media" on the toolbar. Select "Create bootable media".
  • Click "Next" to finish the process.
create a bootable disk

Step 2. Boot EaseUS Partition Master Bootable USB

  • Connect the bootable USB or CD/DVD to your PC. 
  • Press F2 or Del when you restart the computer to enter the BIOS screen. Set and boot your computer from "Removable Devices" or "CD-ROM Drive". And then EaseUS Partition Master will run automatically.

Step 3. Rebuild MBR

  • Click "Toolkit" and choose "Rebuild MBR".

rebuild MBR

  • Select the disk and the type of MBR. Then, click "Rebuild".
rebuild MBR
  • After that, you can see "MBR has been successfully rebuilt on Disk X".
rebuild MBR

By rebuilding the corrupted or damaged MBR of the system hard drive, if by chance the error still occurs after booting up the computer, continue with the other doable methods to get rid of the error, including running diagnostics on your hard drive, check bad sectors and repair if found any, and replace the hard drive and reinstall Windows.

All those complementary solutions reply on the same essential tool EaseUS Partition Master. A detailed tutorial on how to use the mentioned functions is given on the linked pages.

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Updated by Brithny

Brithny is a technology enthusiast, aiming to make readers' tech lives easy and enjoyable. She loves exploring new technologies and writing technical how-to tips. In her spare time, she loves sharing things about her game experience on Facebook or Twitter.

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Written by Jean

Jean is recognized as one of the most professional writers in EaseUS. She has kept improving her writing skills over the past 10 years and helped millions of her readers solve their tech problems on PC, Mac, and iOS devices.

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