What Network Storage Is and Why Your Old Computer Can Do It

Network storage (often called a NAS, or Network-Attached Storage device) is a computer on your home or office network that stores files and makes them available to other devices — your laptop, phone, tablet, or another desktop — without needing to plug anything in with a cable. Instead of emailing files to yourself or using cloud storage, you keep everything on a machine you own and control, sitting in a closet or on a shelf.

An old computer with a working hard drive and a network connection can do this job. It does not need to be fast or have a fancy graphics card. It just needs to stay powered on, connect to your network via ethernet or Wi-Fi, and run software that shares its storage with other devices. This guide walks you through the hardware you need, the software choices, and the actual steps to set it up.

Key Takeaways

  • Your old computer needs a working hard drive, a network connection (ethernet is more reliable than Wi-Fi), and the ability to stay powered on continuously without overheating.
  • You can use the computer's existing operating system (Windows, macOS, or Linux) with built-in sharing features, or install dedicated NAS software like TrueNAS or Openmediavault for more control.
  • Before you start, back up any data still on the computer, then wipe the drive clean if you are using dedicated NAS software.
  • After setup, you access your files from other devices by typing an address into a file browser or using a dedicated app, depending on which software you chose.
  • Network storage runs best on a wired ethernet connection; Wi-Fi works but is slower and less stable for large file transfers.

Check Your Hardware Before You Begin

Start by confirming your old computer can handle the job. Power it on and let it run for at least an hour to make sure it does not overheat or shut down unexpectedly. Check the hard drive — open File Explorer (Windows) or Finder (Mac) and look at how much storage space is available. A drive with at least 500 GB of free space is practical; smaller drives still work but fill up quickly. If the drive is nearly full, you will need to delete files or replace the drive before you proceed.

Next, verify the network connection. Look at the back of the computer for an ethernet port (a rectangular socket slightly wider than a phone jack). If you see one, that is your best option — plug in an ethernet cable and connect it to your router. If there is no ethernet port, the computer has Wi-Fi built in, which will work but transfers files more slowly. Test the connection by opening a web browser and loading a website to confirm the computer can reach the internet.

Finally, decide where the computer will live. Network storage needs to stay powered on all the time, so choose a spot with good ventilation — not inside a closed cabinet or under a pile of papers. A shelf in a closet, a corner of a desk, or a utility room works well. Make sure the power outlet is reliable and the location is not too hot or dusty.

Choose Your Software: Built-In Sharing or Dedicated NAS Software

You have two main paths. The first is to use your computer's existing operating system and turn on file sharing — this is the simplest route and requires no new software. The second is to install dedicated NAS software, which replaces your operating system and gives you more features and control. For a beginner, built-in sharing is usually enough. If you want automatic backups, user accounts with different permission levels, or the ability to access your files from outside your home network, dedicated software is worth the extra setup work.

Built-in sharing works on Windows, macOS, and Linux. On Windows 10 or 11, you can share a folder by right-clicking it, selecting "Share with," and choosing "Specific people." On macOS, go to System Preferences > Sharing and turn on File Sharing. On Linux, you can use Samba, which is often already installed. This approach keeps your computer usable for other tasks — you can still browse the web, watch videos, or run other programs while it serves files to other devices.

Dedicated NAS software like TrueNAS Core (free) or Openmediavault (free) takes over the computer completely. You install it instead of Windows or macOS, and the computer becomes a storage appliance — it does one job very well and uses fewer resources doing it. This software is more powerful but requires you to be comfortable with a command-line interface or a web-based control panel. For most people starting out, this is overkill.

Set Up File Sharing on Windows

If you are using Windows 10 or 11 and want to keep things straightforward, follow these steps. First, create a folder where you want to store shared files — for example, a folder called "Network Storage" on your C: drive or on an external hard drive plugged into the computer. Right-click the folder, select "Properties," then click the "Sharing" tab.

Click "Share" and a window will open. Type the name of another user on your network (or just click "Everyone" to allow any device on your network to access it). Click "Add," then set the permission level — "Read" means other devices can see and copy files but not delete or change them; "Read/Write" means they can also delete and modify files. Choose "Read" unless you have a specific reason to allow changes. Click "Share," then "Done."

Now find your computer's network address. Open Command Prompt (search for "cmd" in the Start menu), type ipconfig, and press Enter. Look for "IPv4 Address" — it will look something like 192.168.1.100. Write this down. On another device on the same network, open File Explorer, click "This PC," then in the address bar type two backslashes followed by your computer's address: \\192.168.1.100 and press Enter. You should see your shared folder. If you see it, your network storage is working.

Set Up File Sharing on macOS

On a Mac, go to System Preferences (or System Settings on newer versions), then click "Sharing." In the left panel, click "File Sharing" and toggle it on. Click the plus sign to add a folder you want to share — navigate to or create a folder for your network storage files. Once the folder is added, select it and look at the "Users" section below. Click the plus sign next to "Everyone" or add specific user accounts and set their permission level to "Read & Write" or "Read Only."

To find your Mac's network address, go to System Preferences > Network, select your active connection (Wi-Fi or Ethernet), and look for "IP Address." On another device, open Finder, click "Go" in the menu bar, select "Connect to Server," and type smb:// followed by your Mac's IP address (for example, smb://192.168.1.105). Click "Connect," enter your Mac's username and password if prompted, and select the shared folder. You should now see your files.

Install Dedicated NAS Software (TrueNAS Core)

If you want more features, TrueNAS Core is a free operating system designed specifically for network storage. read the installer from the TrueNAS website, create a bootable USB drive using a tool like Balena Etcher (free, available for Windows and Mac), and plug the USB drive into your old computer.

Power on the computer and watch for a prompt to press a key to boot from USB — this is usually F12, F2, or Delete, depending on the computer model. Select the USB drive and follow the on-screen prompts to install TrueNAS. The installer will ask you to choose a disk to install on — select your main hard drive. This will erase everything on that drive, so make sure you have backed up any files you want to keep.

After installation, the computer will restart and show you a login screen. The default username is "root" and the default password is "password." Log in, and you will see a command-line interface with a menu. Select "Configure Network Interface" to set up your ethernet connection, then select "Open Web Interface" to access TrueNAS through a web browser on another device. From there, you can create storage pools, set up user accounts, and configure file sharing through a graphical interface.

Connect Other Devices to Your Network Storage

Once your storage is set up and sharing, connecting other devices is straightforward. On a Windows computer, open File Explorer, type the network address (\\192.168.1.100 or whatever your storage computer's address is) in the address bar, and press Enter. On a Mac, open Finder, click "Go," select "Connect to Server," and type the SMB address (smb://192.168.1.100). On an iPhone or iPad, read an app like FileSafe or Transmit, enter your storage computer's address and login details, and you can browse and read files.

For faster and more reliable access, use an ethernet cable to connect your storage computer directly to your router. If you must use Wi-Fi, position the computer as close to the router as possible and avoid obstacles between them. Ethernet is always faster for large file transfers — if you regularly move files larger than a few hundred megabytes, the speed difference will be noticeable.

Common Problems and How to Fix Them

If other devices cannot see your storage computer, first check that both the storage computer and the device trying to access it are on the same network (connected to the same router). Restart both devices — this fixes most connection problems. If you are using Wi-Fi, move the storage computer closer to the router and try again. If you are using Windows file sharing and still cannot connect, open Windows Defender Firewall on the storage computer, click "Allow an app through firewall," find "File and Printer Sharing" in the list, and check both the "Private" and "Public" boxes.

If files transfer very slowly, check your network connection. On the storage computer, open Command Prompt and type ping 8.8.8.8 — if you see response times under 100 milliseconds, your connection is good. If times are much higher or you see timeouts, move the computer closer to the router or use an ethernet cable. If the storage computer keeps shutting down or restarting on its own, it may be overheating — make sure it has clear space around it for air to flow, and consider adding a small fan to the room.

Frequently Asked Questions

Can I use an external hard drive instead of the computer's internal drive?

Yes. Plug an external hard drive into the computer via USB, and share that folder instead of using the internal drive. This is useful if the internal drive is small or failing. External drives are slower than internal ones, so file transfers will take longer, but it works fine for occasional use.

What if I want to access my files from outside my home network?

Built-in Windows and macOS sharing only works on your local network. To access files from outside your home, you need either a VPN (Virtual Private Network) connection to your home network, or dedicated NAS software like TrueNAS that supports remote access. Setting up a VPN is more complex and beyond this guide; TrueNAS includes remote access features in its web interface.

How much electricity does a network storage computer use?

An old desktop computer running continuously uses roughly 50 to 150 watts, depending on the model and how hard it is working. A laptop uses less, around 20 to 50 watts. Running 24/7, a desktop might add $5 to $15 per month to your electric bill. If cost is a concern, a dedicated NAS device or a Raspberry Pi with external storage uses much less power.

Do I need a monitor and keyboard plugged into the storage computer?

No. Once setup is complete, you can unplug the monitor and keyboard and access the computer entirely over the network. If you use dedicated NAS software, you manage it through a web browser on another device. If you use built-in sharing, you do not need to interact with the storage computer at all after setup.

What happens if the storage computer loses power?

Any files being transferred will be interrupted, but files already saved are safe. When power returns, the computer will restart automatically (on most models) and resume serving files. To avoid unexpected shutdowns, plug the computer into an uninterruptible power supply (UPS) — a battery backup device that keeps it running for 10 to 30 minutes during a power outage, giving you time to shut it down properly.