[Fixed] Non System Disk or Disk Error on Laptops/PC

Summary

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.

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."

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 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 3 basic approaches, which usually helps fix the setup and stop error during Windows installation or startup.

1. Remove all the non-bootable storage devices that the computer has trouble to boot from, including the bootable CD/DVD disc, USB flash drive or floppy disk.

2. 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.

3. Access to your computer's BIOS 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.

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 bootable media data recovery software to access and recover hard drive data without OS; later, download EaseUS bootable partition manager to rebuild MBR.

Tips

 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.

 

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

Preparations:

First, please download and install EaseUS Data Recovery Wizard WinPE Edition on a working computer.

Then, create a WinPE bootable disk of EaseUS data recovery software, which will help you access your hard drive data without booting into Windows. 

1. Launch EaseUS bootable data recovery software on a working computer.

2. Select CD/DVD or USB drive and click "Proceed" to create a bootable disk. 

Details to recover data from crashed OS

Connect the WinPE bootable disk you have made to the PC with the corrupted Windows system, restart the computer and go to BIOS to change the boot sequence. Press F2 when you start your PC. It will allow you to run EaseUS data recovery software and recover data without Windows.

1) Select the disk where you want to recover data and click the "Scan" button.

2) Let the software scan the selected disk to find all the files and folders.

3) Preview and choose the files you want, click "Recover" button to save them to a safe place. You'd better choose a different drive to avoid data overwriting.

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

Step 1. Download and install EaseUS Partition Master Professional on a normal computer.

Step 2. Click Create WinPE bootable disk.

Step 3. Choose USB or CD/DVD disc to create a bootable disk of EaseUS Partition Master.

Step 4. Run EaseUS Partition Master from WinPE bootable disk on your dead computer.

Step 5. Right-click on the problematic boot disk and select Rebuild MBR.

Step 6. Choose the proper operating system version.

Step 7.  Confirm the operation and click Apply.