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

Jean updated on Aug 04, 2019 to Storage Media Recovery | How-to Articles


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
General troubleshooting for non-system disk or disk error
Advanced troubleshooting for non-system disk or disk error (data protected)

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.

 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

1. Create a WinPE Bootable Disk

First, 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.

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

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

select a location and click scan

2. Recover data from crashed OS

Connect the WinPE bootable disk you have made to the PC with the corrupted Windows system, then, 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.

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

select the disk

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

scan the disk

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

recover data from the disk

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.

create easeus partition master 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.

select rebuild mbr to fix non system disk or disk error

Step 6. Choose the proper operating system version.

choose windows operating system version

Step 7.  Confirm the operation and click Apply.


100% of people found this article helpful.


Frequently Asked Questions

1. Why choose EaseUS Data Recovery Wizard?

"EaseUS Data Recovery Wizard is the best we've seen. It's far from perfect, partly because today's advanced disk technology makes data-recovery more difficult than it was with the simpler technology of the past, but it's fast and efficient..."PCMag

"The first thing you'll notice about EaseUS Data Recovery Wizard Pro is that its interface is very clear and uncluttered, with only a small collection of self-explanatory controls. You won't find lots of extra options hidden in a system of hidden menus, either; what you see really is what you get."techradar

"Recover lost files, even after deleting a partition or formatting your drive."Macworld

2. Why cannot I recover 2GB data for free?

It is recommended to check the version installed is Free or Trial because they are different versions.

Trial has data preview function but cannot save any files, while the Free version enables to recover 2 GB files. The default free space is 500 MB and you may share the product on social media to get another 1.5 GB.

3. Why cannot the recovered files be opened?

A file is saved as 2 parts on the storage device: directory info (which is comprised by file name, time stamp and size info, etc.) and data content.

If the files with original file names and folder structures cannot be opened, one possible reason is the corrupted directory info. There is still a chance to recover the data content with the RAW Recovery method in our software.

4. Why isn't it suggested to recover the files back to the original drive?

The storage structure of the lost files would be altered or damaged by any changes on the drive. If you save the recovered files back to the same drive, the original data structures and data content would be corrupted or overwritten, which causes permanent data loss. So you should prepare another disk to save the files.

5. How can I check whether my data is recoverable or not before purchase?

The Free version helps you save 2GB files to better verify the recovery quality of our product before purchase.

6. How long does it take to scan the drive?

It strongly depends on the capacity of your hard drive and the performance of your computer. As reference,most drive recoveries can be completed in around 10 to 12 hours for a 1-TB healthy hard drive in general conditions.

About Data Recovery Wizard

It's super easy to recover 250+ types of files after deletion, disk formatting and virus infection. Click the links and compare the difference of each version.