When the computer BIOS cannot detect a bootable operating system on any of the storage devices included in the notebook computer's boot path, the Non-System Disk Error or Disk Error message appears.

Here are a few APPROACHES that may be useful, and any of them may be the answer to your problem.

Method 1: Examine all non-bootable storage media.

First and foremost, make a list of all non-bootable storage devices connected to the computer and remove or detach them. When you connect many devices to a computer, the system may have trouble determining which device has the OS loaded, which can result in an error like this. As a result, disconnect all non-bootable external devices.

Method 2: Check the IDE ( Integrated Drive Electronics ) or SATA ( Serial Advanced Technology Attachment )cable on the HDD.

If your hard disk's IDE or SATA cable is damaged or improperly attached, the system may be unable to read the disc, resulting in the "non-system disc error." If the cable is damaged or malfunctioning, simply reconnect it properly or purchase a new one.

If the HDD cable is in good shape and securely attached, but the error remains, it's possible that the HDD on which WINDOWS was installed is not set as the primary disc in BIOS.

Method 3: If necessary, change the boot order.

ACCESS the BIOS/UEFI environment on your PC and make sure the hard disc drive you're trying to boot from is in the correct boot order settings, which should be at the very top of the boot order list. To alter the boot order, follow these steps:

• While the computer is RESTARTING, press the key required to enter the BIOS or UEFI setup screen (usually Esc, F2, F8, F10).
• Select the Boot tab in BIOS with the arrow keys on the keyboard and give the system drive the boot priority, which should be set at the top.
• The mouse pointer can be used to specify the boot sequence in UEFI.
• The BIOS/UEFI setup utility should be saved and exited. The computer will reboot with the new settings in place.

Method 4: REINSTALL the hard drive.

Another option for resolving this issue is to remove and reinstall the hard disc.

Steps:

• Remove the power cable/charger from the PC and turn it off.
• Then the battery should be removed (for laptops).
• Disconnect the hard drive from the computer.
• After blowing out the dust, clean the hard disc using a dry rag.
• Reconnect it to your computer.
• Return the battery to its original position.
• Connect the charger or power cable.
• Restart the computer.

Method 5: Access hard drive and recover data from the hard disk without OS.

Except for external influences, you must accept the fact that something went wrong with the hard disc drive's boot files, which may have gotten damaged or corrupted, and that fixing the HDD's boot sector, master boot record (), and boot configuration data (BCD) must take effect.

• Make a bootable Disk.
• Proceed by booting from the bootable USB.
• Recover data from a non-booting hard drive.