Why is my second SATA hard drive not detected Windows 10?

There are a few common reasons why your second SATA hard drive may not be detected in Windows 10. The SATA (Serial ATA) interface is the most common way to connect internal hard drives in modern PCs. If you’ve added a second SATA drive but it’s not showing up as expected, some troubleshooting steps can help identify and resolve the issue.

Some common causes include:

  • The SATA cable is loose or damaged
  • The power cable to the drive is loose or unplugged
  • The drive is not properly seated in the bay
  • The drive is damaged or malfunctioning
  • The SATA port on the motherboard is disabled in BIOS
  • Outdated drivers or firmware
  • Drive is not initialized or formatted correctly

We’ll dive into each of these issues in more detail and provide steps to diagnose and fix the problem. With some simple checks and tweaks, you should be able to get your second hard drive up and running.

Check SATA Cable Connections

The first thing to check is whether the SATA cables are properly plugged in. SATA cables have a long, thin L-shaped connector on one end that plugs into the motherboard, and a shorter flat connector that plugs into the back of the drive.

Check that both ends of the SATA data cable are firmly pushed all the way into their ports. Wiggling the connectors slightly while pressing them in can help ensure full insertion. Listen for a firm click when fully seated.

Also verify that the SATA power cable from the power supply is firmly connected to the back of the drive. Check other SATA devices like your primary hard drive and DVD drive to see if they are recognized correctly, which can help rule out a bad port or controller.

If the connections are loose, damaged, or inserted incorrectly, the drive will not be detected. For example, if the SATA cable is partially unplugged, Windows may detect the drive briefly as it connects and disconnects. Reconnect any loose cables firmly and replace any damaged SATA cables.

Check Drive Power Cables

Make sure the power cable from your power supply is firmly plugged into the back of the secondary hard drive. Some drives require two power connectors, so verify both are connected if applicable.

If the drive is new, ensure you have an available SATA power connector from your power supply to use. Some power supplies only include enough SATA power cables for the primary hard drive and DVD drive. You may need to use a SATA splitter or adapter cable to add connectors, or upgrade to a higher wattage power supply with more SATA power ports.

Also check that the power cable is not damaged or pinched, and that you have full power from that SATA connector. Try swapping it with a power cable from another device like your DVD drive to see if the drive is detected then. If it is, the issue is likely a faulty power cable.

Reseat the Hard Drive in the Bay

If the drive is installed in a desktop computer, open the case and check that the hard drive is firmly seated in the drive bay. Over time, drives can come slightly loose from the SATA and power ports.

Remove the drive screws that hold it in the bay, gently pull it out, and carefully reinsert it. Make sure it is fully inserted straight into the SATA and power ports before replacing the screws. Improper insertion into the bay can prevent proper connections.

For laptop hard drives, you’ll need to open up the bottom cover to access the hard drive bay. Refer to your laptop’s service manual for exact removal and reseating steps. But again, take out the drive, make sure there is no debris or obstruction in the bay, and firmly re-insert the drive.

Test the Drive Itself

To confirm that the drive itself is not faulty, try installing it in a different desktop or external USB enclosure to see if it is detected there. If the drive is detected properly on a different system, the issue likely lies with the SATA controller, drivers, or BIOS settings of your original system.

However, if the same drive is still not detected when connecting via USB or installing in another PC, the drive itself is likely faulty and should be replaced. Hard drives can develop bad sectors or mechanical faults that prevent them from being used as secondary drives. Try installing and testing a different second hard drive to narrow down the cause.

Update SATA Controller Drivers

Outdated motherboard drivers can also prevent drives from being detected properly. Go into Windows Device Manager and expand the Disk drives category. If your SATA controller or chipset is labeled with a yellow exclamation point, that indicates a driver issue.

Right-click the controller device and select Update driver. Allow Windows to search automatically for the latest driver from the internet or your PC manufacturer’s website. Reboot after the driver update finishes and check if your second hard drive is detected.

You can also visit your motherboard manufacturer’s website and manually download the latest chipset or SATA controller drivers. Make sure to get the correct drivers for your Windows version and motherboard model. Properly updated drivers help ensure maximum compatibility with drives and peripherals.

Enable SATA Ports in BIOS

Another common reason a second hard drive may not show up is that its SATA port is disabled in BIOS. Enter your system BIOS setup, usually by pressing F2, Delete, or a function key on bootup. Navigate to the configurations for SATA, On-board Devices, or Integrated Peripherals.

Locate the option for your second SATA port and make sure it is enabled. Some BIOS versions label the specific SATA ports, while others simply number them. Refer to your motherboard manual to identify the correct port if necessary. Enabling the SATA port should allow the drive to be detected after rebooting and entering Windows.

Initialize and Format the Disk

Once the drive is detected in Windows, you may need to initialize it and format it before it can be used. Search for Disk Management in the start menu. Here you can find your newly detected drive, which should show up as an Unknown disk with unallocated space.

Right-click the disk block and select Initialize Disk. Choose your desired disk partition style – GPT or MBR. GPT is newer and required for drives over 2TB. Click OK allow the disk to initialize. It should now show up as an online drive block.

Right-click the unallocated block and choose New Simple Volume. Walk through the prompts to format and assign a drive letter. NTFS is the standard file system for modern Windows PCs. Once completed, your new drive and storage capacity should appear in File Explorer ready for use.

Run CHKDSK and SFC Scans

As a precaution, run scans to check for file system errors or corrupt files preventing drive detection. Open an elevated Command Prompt window in Windows. Type “chkdsk /f” without quotes and hit Enter to run an error checking scan on your boot drive. Allow scan to complete and reboot PC if prompted.

Next type “sfc /scannow” to run a System File Checker scan verifying Windows system files. This can help replace any critical files needed for proper drive operation. Reboot computer when scan finishes. Check if second hard drive is now detected in Windows.

Troubleshoot with Manufacturers’ Tools

Most hard drive and motherboard manufacturers provide their own drive diagnostic and troubleshooting tools which can help pinpoint issues. For example:

  • Seagate SeaTools – Comprehensive drive testing for Seagate brand HDDs
  • WD Data Lifeguard – Diagnose issues on Western Digital hard drives
  • Intel Rapid Storage Technology – Manage and monitor Intel SATA controllers
  • ASUS EZ Diagnosis – Tools to test ASUS motherboard components

Consult your hardware documentation for links to available utilities. Run the appropriate tool to analyze your second hard drive or SATA controller for problems. Updating firmware and drivers may also be required in some cases.


Troubleshooting hard drive detection issues requires methodically checking cables, connections, BIOS settings, drivers, and the drive integrity itself. With enough patience and by following these steps, you should be able to identify and resolve the underlying problem and successfully add your new SATA hard drive for extra storage capacity. Be sure to backup any important data first before running diagnostics or repairs on your system.