The error means that the computer can not find any partition on the Hard disk which has an Operating System. This however doesn’t mean that the Operating System suddenly disappeared from the Hard drive. There are various reasons that may cause the error other than the sudden disappearance of the OS.
Causes of Hard Disk – (3F0) Error
Solutions 1: Fix BIOS Settings
The most straightforward way to fix this is to reset the BIOS settings to their default state with the following steps: Another fix for the BIOS Settings is to set the Hard Disk to the primary boot device. One more fix for the BIOS Settings is to make the System be able to access data on the Hard Disk despite its partitioning style (MBR/GPT). BIOS Settings configure the computer to boot in either UEFI mode or Legacy mode. MBR partition style can be accessed if the computer boots from the Legacy mode whereas the GPT partition style can be accessed if the computer boots from UEFI mode. Some computers provide options for booting with both UEFI mode and Legacy mode while others provide only one option. If these BIOS Settings tweaks don’t solve the error, try the next solutions
Solution 2: Fix the Boot Loader
This solution requires you to have a USB drive which is bootable with Ubuntu. You can follow this guide to create a bootable USB drive with Ubuntu. After creating a bootable USB drive, follow these steps to fix the boot loader.
Solution 3: Install Windows 10 alongside the existing Ubuntu
This can be a solution where the computer is unable to find the Ubuntu boot loader or if the partition with the boot loader is corrupt. Installing Windows 10 will set the computer to use the Windows 10 boot loader as the default instead of the Ubuntu boot loader.
Solution 4: Replace the Hard Disk
This should be the last option since it has the most negative effect in terms of the cost as well as the data loss. Before buying a new Hard Disk, you can try using this Hard Disk as an external drive and see if you can access it and if you can then you probably won’t have to throw it away.
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