How To Partition a Hard Drive on Windows or Mac - Without Losing Data

Partitioning a hard drive might seem like a technical task, but it offers several benefits that can significantly improve your computer's performance and data security. 

When you partition a hard drive, you’re splitting the drive up into specific, segmented parts. This creates additional components within it to organize data and enhance your data security. Most hard drives, including external hard drives, come with a single partition that you can split into smaller partitions. Before we go over the step-by-step on how to partition a hard drive, there are two important things to know:

First, what is a partition on a hard drive?

A partition on a hard drive is a logical division of the physical hard drive into separate, isolated sections. Each partition appears to the computer's operating system as a distinct storage unit, and it can store data, files, and software independently of other partitions on the same hard drive.

Second, what is partitioning a hard drive?

Partitioning a hard drive is the process of dividing a single physical hard drive into multiple separate, logically isolated sections or partitions. Partitioning a hard drive can help improve the performance of your computer, organize your data, and keep your important data separate from less important data. It can also aid in data recovery if your hard drive is damaged, as the other partitions on the hard drive will still be accessible.

How to partition hard drive on Windows

There are a few ways to create partitions on hard drives, depending on your operating system. After you have created the partitions on your hard drive, you can format them so that they can be used by your computer. To format a partition, right-click on the partition and select Format Partition. Choose the file system that you want to use for the partition and click OK to format it.

Warning: To finish the process you’ll have to format the disk. Make a backup of your hard drive data before partitioning it to avoid data loss.

If you’re using the Windows operating system, you can use the Disk Management tool, Disk Utility, or Diskpart to create partitions on a hard drive.

Create a partition on a hard drive with Disk Management

Disk Management is a built-in Windows utility that provides a graphical interface for managing drives. This is a safer and more visual alternative to using command-line tools.

Step 1: Open the Disk Management Tool

1. Connect the hard drive to your computer.
2. Press the Windows Key + R on your keyboard to open the Run dialog box.
3. Type diskmgmt.msc into the box and press Enter.

Step 2: Initialize the Hard Drive (If Prompted)

1. Locate your hard drive in the list of disks at the bottom of the window.
2. If the drive is brand new or completely blank, it may show as "Not Initialized." Right-click the disk name (e.g., Disk 1) and select Initialize Disk.
3. Choose a partition style (GPT is recommended for modern systems) and click OK.

Step 3: Create a New Partition

1. Look for the long bar representing your drive's storage. It will likely be labeled as Unallocated space.
2. Right-click on this unallocated space and select New Simple Volume from the menu.
3. Click Next on the wizard screen that appears.

Step 4: Specify Partition Size, Drive Letter, and Format

Follow the on-screen prompt steps to configure your new drive:

• Specify Volume Size: Enter the amount of storage space you want for this partition. Note that the size must be entered in Megabytes (MB). For example, enter 102400 for a 100 GB partition. Click Next.
• Assign Drive Letter: Choose an available drive letter from the drop-down menu (such as H) to identify your drive. Click Next.
• Format Partition: Choose your file system (select NTFS for standard Windows usage) and make sure that "Perform a quick format" is checked. Click Next.

Finally, click Finish. Windows will quickly format the drive, and your new partition will be ready to use in File Explorer.

Partition hard drive on Windows with DiskPart

DiskPart is an advanced command-line utility built into Windows. Because it lacks a graphical interface, you should proceed carefully and ensure you enter each command exactly as shown.

Step 1: Open Command Prompt as Administrator

1. Connect the hard drive to your computer.
2. Type cmd in the Windows Search box.
3. Right-click Command Prompt from the results and select Run as administrator.

Step 2: Run DiskPart Commands

Type ‘diskpart’ and press ‘Enter’ to launch the utility. Next, type the following commands one by one, pressing ‘Enter’ after each:

1. list disk (This shows all connected drives. Take note of your hard drive's disk number.)
2. select disk X (Replace X with your actual disk number.)
3. create partition primary size=XXXX (Specify the size of the partition.)
4. assign letter=H (Assign a drive letter to the new partition.)
5. format fs=ntfs quick (Quickly format the partition so it is ready to use.)
6. exit (Close the DiskPart utility.)

Important Notes:

• Selecting the right disk is critical: In the select disk X command, make absolutely sure you replace X with the correct disk number identified from the list. Selecting the wrong disk can result in data loss.
• Size calculation: The size must be entered in Megabytes (MB). For example, if you want a 100 GB partition, multiply 100 by 1024 and enter size=102400. If you omit the "size=" part entirely, DiskPart will automatically use all available remaining space on the drive.
• Drive letter: Replace H with any available drive letter you prefer.

How to partition hard drive on Mac

If you are using macOS, you can use the built-in Disk Utility tool to create partitions on your hard drive.

Step 1: Open Disk Utility and Select Your Drive

1. Connect the hard drive to your Mac.
2. Open Finder and navigate to Applications > Utilities > Disk Utility.
3. Select your hard drive from the list of disks in the left sidebar.

Step 2: Access the Partition Menu

1. Click the Partition button in the top toolbar.
2. Click the Add button (+) located below the storage pie chart to create a new partition.

Step 3: Configure Your Partition Settings

In the options pane on the right, fill in the details for your new partition:

• Name: Enter a name for the partition in the Name field.
• Format: Choose a format for the partition from the Format drop-down menu. (The most common option for cross-platform compatibility is ExFAT).
• Size: Enter the desired size of the partition in the Size field, or drag the slider on the pie chart to adjust it.

Source: Apple support

Step 4: Apply the Changes

1. Click the Apply button.
2. Review the confirmation prompt and click Partition to complete the process.

Why partition a hard drive

Partitioning enables you to tailor your hard drive's usage to your specific needs. For instance, it allows you to store certain types of files on separate partitions, which can help improve your hard drive's performance. For example, you can store frequently accessed files on one partition and infrequently accessed files on another partition. If one partition is damaged, the other partitions on the hard drive will remain accessible, which can be helpful if you need to recover data from a damaged hard drive.

Boosts performance

Partitioning can improve your computer's performance. For instance, you can place frequently used files on a separate partition to reduce data fragmentation, thereby speeding up access times.

Facilitates organization

By creating partitions, you can better organize your data. For example, you might have one partition for your operating system and software, another for personal files, and yet another for backups or multimedia content. This separation helps keep things tidy and makes it easier to manage your data.

Helps with data recovery

If you encounter issues with one partition (e.g., data corruption or a system crash), the other partitions are often unaffected. This isolation can improve your chances of recovering data from a damaged drive.

Improves security

You can enhance data security by keeping sensitive files on a separate partition. This makes it easier to apply encryption or restrict access to specific partitions.

Best practices to follow when partitioning a hard drive

By following the best practices when partitioning your hard drive, you can ensure that its partitions are set up correctly and optimized for your specific needs.

Backup your data

Before partitioning your hard drive, it's important to back up all your data to avoid data loss. This is because the partitioning process involves formatting the hard drive, which will erase all data on it.

Plan your partitions

Plan how you want to partition your hard drive based on your specific needs. For example, you might want to create separate partitions for your operating system, applications, personal files, and backups.

Choose the right file system

When formatting your hard drive partitions, choose the file system that best suits your needs. For example, NTFS is the default file system on Windows, while macOS uses HFS+ or APFS.

Label your partitions

Give each partition a meaningful label that reflects its purpose. This will make it easier to identify and manage your partitions later on.

Leave some unallocated space

Leave some unallocated space on your hard drive for future use. This will give you the flexibility to create new partitions or expand existing ones as your needs change.

Summary

Partitioning hard drives improves performance and aids recovery if a drive is damaged. This action can also help you organize your files and applications, and keep your important data separate from less important data.

When creating a new partition on your hard drive, you must first back up your data. If something goes wrong and you lose your files, contact SalvageData immediately for secure, guaranteed hard drive data recovery.