Add a new internal hard disk (without removing an existing disk)

1. Turn off your computer, disconnect the power, and remove your computer’s cover. If you have a laptop, check the information from the manufacturer to find out if there is a panel you can remove to access the hard disk.
2. Insert the new hard disk into an empty hard disk bay in your computer case. You might need a small screwdriver to screw the disk into your case. Different cases have different ways of holding hard disks. Many slide in and out of the case on rails.
3. Connect one cable from the computer’s power supply to the power connector on the back of the hard disk.
4. Depending on what type of hard disk you have, connect the IDE cable or SATA cable from the back of the disk to the IDE or SATA connector on the computer’s motherboard. IDE cables are wide and flat with large connectors, while SATA cables are thin with small connectors. For more information, check the information that came with the hard disk.

Preparing to use a new hard disk

If you've installed your new hard disk correctly, your computer should recognize it. When you turn on your computer, the basic input/output system (BIOS) should automatically detect the new hard disk.

If you plan to use the new hard disk as the primary partition that contains Windows, then you'll have to install Windows on the disk before you can use your computer. You'll need a Windows 7 installation disc to do this. For more information, search Help and Support for "Installing and reinstalling Windows."

If you plan to use the new hard disk as a secondary disk (one that does not contain Windows), you should be able to see the new hard disk drive the next time you start your computer and log on to Windows. After Windows starts, click the Start button , click Computer, and then look for your new drive. The letter assigned to the drive will depend on your computer’s configuration. If you don't see the new hard disk drive, try looking for it in Computer Management.

1. Click to open Computer Management.‌  If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
2. In the left pane, under Storage, click Disk Management, and then look for the new drive.

You'll probably have to format the hard disk before you can use it. For instructions, see Formatting disks and drives: frequently asked questions. Follow these same instructions to format an old hard disk that contains data you want to erase.

If your computer doesn't recognize the new hard disk, double-check the installation instructions that came with the hard disk. If you have additional questions, go to the manufacturer's website.