A disk with too many bad sectors won't be recognized by system. Hard drive bad sector does not respond to read or write requests.
If a new hard drive cannot be detected by the system BIOS, the cause might be that the disk is not enabled.
Disk is not enabled in bios or device manager. If your computer cannot recognized connected hard drive, there is a possibility that the disk's driver is outdated or not compatible with operating system. If you check a disk in Disk Management and it is marked as "Unknown, Not initialized", and it won't show in system. If it is the case, we can fix the disk not showing issue by assigning a drive letter. A partition without a drive letter does not show in File Explorer. Hard disk does not have a drive letter. If a hard disk contains no partition and all disk space is unallocated, it won't show in Windows Explorer. In some cases, storage device is not properly connected to computer and it cannot be recognized, for example, there might be something wrong with power supply, cable or USB port, etc. Here is a list of possible causes of the problem, and you can refer to these factors: There is a variety of reasons why Windows or BIOS cannot detect the presence of your hard drive. Don't worry! The disk not showing up issue can be fixed in most cases, and the following content will help you dig causes and solutions. Perhaps you are trying to looking for solutions to this problem. If files on the hard drive do not have a backup, you might be driven mad by this issue. Once a hard drive is not recognized on computer, you are no longer able to access data stored on it. In some cases, even new hard drive cannot be recognized by computer. There are several scenarios of this problem, for example, hard drive shows up in Disk Management not in Windows, disk not showing in Disk Management, hard disk shows up in BIOS but not in Windows, hard drive cannot be detected in BIOS, USB drive or external hard drive not showing up, etc. As long as you have a hard drive running on your computer, it's only a matter of time before you get the problem. Hard drive not showing up is a common issue you may encounter during using computer. Your computer failed to recognized disk, and you connect the disk to another PC, and end up with same result. You installed a hard drive on your computer and open File Explorer, but to your dismay, there is not drive icon representing the hard disk. Method 6: Check for driver updates manually Method 5: Run hardware and devices troubleshooter Method 4: Assign a drive letter for the drive Method 3: Partition and format the hard drive Method 2: Initialize and format hard drive 
Method 1: Check hard drive cable connection Reasons why hard drive is not showing up in Windows Symptom of hard drive not showing up issue
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