Solved: Second Hard Drive Not Detected in Windows 10 /8/7

April 30, 2019

No matter whether your second hard drive is not detected in Windows 10 PC, Disk Management, or even in BIOS, you can try the methods on this page to solve this problem.


“For some reason my secondary hard drive, a Samsung HD203 WI drive (2Tera), keeps disappearing randomly while Windows 10 is running. But when I completely shut down the computer and then boot it back up, the second hard drive will come back fine. The drive stays until some random moment when Windows cannot detect it any more. With a simple restart, the drive cannot be detected and won’t show up, only after I shut down the machine completely, and push the power button back on, does this work. Why that occurs? How can I solve the second hard drive not detected in Windows 10? Any help is appreciated.”

Why second hard drive not showing up in Windows 10/8/7?

What on earth leads to second hard drive not detected in Windows 10/8/7? Well, below are some major reasons you can take a look at:

>Connection issues: the hard drive is not connected properly. Or the power supply, cable or USB port, etc might go wrong.

>Hard drive is not initialized: Disk marked as "Unknown, Not initialized" in Disk Management, so you cannot see it in File Explorer, either.

>Hard drive not being partitioned: the hard disk has no partition and all disk space is unallocated, it won't show up in Windows Explorer.

>Hard disk partition without a drive letter: if a partition of the hard disk does not have a drive letter, then you cannot find in Windows Explorer.

>Outdated disk driver: when the driver of the hard disk is outdated, it won’t be detected by your computer or system.

>Bad sectors on the disk: when there are many bad sectors on the disk, the Windows system might be unable to recognize it.

Effective solutions you can try

The second disk sometimes cannot be found in File Explorer, but you can get it in Disk Management, or you cannot see it in both of them, different situations need different solutions, we will show you how to fix “second hard drive not detected in Windows 10/8/7” under various cases.

Before proceeding: firstly, you had better check whether the hard drive cables are connected correctly and the two cables work well. That’s because if the connection cables get loose, there is a possibility that the disk does not show up in Windows. Besides, ensure the SATA port, USB port and power supply are fine, too. If all the things are fine, please read further to check out more technical solutions.

Case 1. Second hard drive not showing up in File Explorer

If you cannot find the second hard drive in File Explorer, but you are able to see it in Disk Management, following solutions might help.

Solution 1. Initialize and partition hard drive

When the hard drive is not initialized, you won’t be able to see and read it in Windows File Explorer.

> >Initialize hard drive: right-click "This PC/ My Computer">"Manage"> "Disk Management", find the hard drive and right click it, select Initialize Disk from the given menu, then follow the hints to initialize the disk into MBR or GPT. Besides you can also use PowerShell to initialize disk.

After you initialize the disk, the disk will be shown as unallocated space, then you need to partition it to make the drive visible in Windows.

> >Partition hard drive: in Disk Management, right-click on the unallocated space and select "New Simple Volume". Then the New Simple Volume Wizard will be launched to guide you through the process of creating a new partition.

The method helps you create one partition easily, but what if you plan to create multiple partitions? Repeats the steps above for times? It is quite time-consuming, right? So here we highly recommended you use AOMEI Partition Assistant Professional, which is able to quickly partition a hard drive into multiple partitions at one time, and the process is simple and quick.

Step1. Install and launch AOMEI Partition Assistant Pro from your computer. Right-click the second hard drive and select "Quick Partition".

Step2. In the pop-out windows, you can set the disk type, partition counts, partition size, and volume name, file system and so on. After all those done, click "Start Partitioning".

Quick Partition

With two clicks, you can create multiple partitions at one time instead of creating them one by one.

Solution 2. Assign a drive letter

Lack of drive letter, the second hard drive won’t show up on This PC/My Computer, either. So try changing the drive letter following the below steps.

Step 1. In Disk Management, right click the second hard drive and select "Change drive letter and path".

Step 2. Choose a letter for your partition from the list and confirm.

Assign Drive Letter

Step 3. Then restart your computer.

Note: if the Change Drive Letter and Paths Greyed Out in Windows 10/8/7, you can turn to AOMEI Partition Assistant Pro, too.

Case B. Second Disk does not show up in Disk Management

If you cannot even find the second hard drive in Disk Management, then other different solutions are required.

Solution 1. Update the driver

If the second hard disk driver is outdated, then it won’t appear in Disk Management and File Explore. In this case, you need to update the driver in Device Manager:

Step 1. Right-click on Start, click "Device Manager".

Step 2. Expand Disk driver and locate the hard drive which cannot be detected by Windows.

Step 3. Right-click on the disk and select "Update Driver Software" from context menu.

Step 4. Select "Search automatically for updated driver software".

Update Driver

In addition to, you can directly right-click on the second hard drive in Device Manager and select Uninstall, then restart PC and Windows will automatically update and reinstall the driver of the disk.

Solution 2. Check and fix bad sectors on the second disk

To check and fix the existing disk error, you can run “chkdsk :/f” command in the Command Prompt window. Here is an example to check and fix errors on G: drive.

CHKDSK Disk Error

But if you are not familiar with it, you can switch to the AOMEI Partition Assistant. It could also make checking and fixing the error a simple process.

Step 1. Run the software, right-click the second hard disk and click "Advanced"-> "Check Partition".

Check Partition

Step 2. Select the first way to check as well as fix the disk error, and click OK.

Check And Fix

Case C. Second hard disk not showing up in BIOS

When you find your hard drive is not showing up in BIOS, try the following steps to troubleshoot the problem.

Step 1. Restart your computer and keep pressing F2 (or F1, Delete) to enter BIOS;

Step 2. Enter Setup and check system documentation to see whether the second hard drive is turned Off in System Setup or not;

Step 3. If it's Off, turn it ON in System Setup.

Step 4. Reboot PC to check if it can be recognized in Disk Management.


So many effective methods introduced elaborately, it won’t be challenging to deal with “the second hard drive not detected in Windows 10/8/8.1/7” issue. More importantly, AOMEI Partition Assistant can also help solve other similar disk issues like BIOS detect hard drive but Windows does not, USB flash drive showing 0 bytes or no media, etc.