How to Dual Boot Linux on Windows PC Without a USB Drive

Trisha

3 hours ago

Many people want to try Linux alongside their existing Windows setup for dual booting, but they face a common hurdle: creating a bootable USB drive. You might not have a spare pendrive, or your USB ports could be faulty. The BIOS/UEFI settings often add mystery too—figuring out boot order, secure boot, or legacy mode feels confusing. What if you could skip the bootable media entirely and boot a Linux live environment directly from your hard drive?

There is a straightforward method using UNetbootin to set up a temporary Linux boot entry on your Windows PC. It lets you access a live Linux session (like a live CD) without any external drive. From there, install Linux fully on a separate partition for true dual booting. This approach works on many systems, though success varies with UEFI setups and distros.

Important note: Always back up important data first. Partitioning carries risks, and modifying boot entries can cause issues if done incorrectly. This method uses a “frugal” or hard disk install mode, which adds a boot option via the Windows bootloader.

What You Need Before Starting

A Windows PC (Windows 10 or 11 works best).
At least 20-30 GB free space on your drive for a Linux partition (more for comfortable use).
Download a Linux ISO (e.g., Ubuntu, Linux Mint, etc from their official sites).
Download UNetbootin from its official site (unetbootin.github.io). Get the Windows version.
Administrator rights on Windows.

Step 1: Prepare Your Disk Space (if Installing Linux Permanently)

Before anything, create space for Linux if you plan a full install.

Right-click Start and then select Disk Management.
Right-click your main Windows partition (usually C:) and choose Shrink Volume.
Enter space to shrink (e.g., 50000 MB for ~50 GB). This creates unallocated space.
Leave it unallocated for now—the Linux installer will format it later.

Skip this if you just want to try Linux live without installing.

Step 2: Set Up UNetbootin for Hard Disk Boot

UNetbootin can add Linux boot files to your hard drive and create an entry in the Windows boot menu.

Run UNetbootin as administrator.
Choose Diskimage (instead of a listed distro).
Browse and select your downloaded Linux ISO file.
In the Type dropdown, select Hard Disk (not USB).
For Drive, it often shows your main drive (like C:). Select it.
Click OK and let it finish. UNetbootin copies files and adds a boot entry.

This process is quick and places Linux kernel/initrd files on your C: drive (usually in a folder like /boot or hidden).

Step 3: Boot into the Linux Live Environment

Restart your computer.
As it boots, watch for the Windows Boot Manager screen (it may appear automatically or hold Shift during restart from Windows).
You should see a new entry like UNetbootin.
Select it and press Enter.

Your PC boots into the Linux live session—just like from a USB or CD. It runs entirely from RAM and your hard drive files, so feel free to explore, test hardware, browse, or play with apps.

Removing or Uninstalling the Setup

If you only wanted to test and don’t install:

Boot back into Windows.
Run UNetbootin again.
It asks if you want to Uninstall the added boot entry.
Confirm, and it removes the files and boot menu item cleanly.

No leftovers remain.

Conclusion

Bypassing the need for a bootable pendrive makes trying Linux much easier, especially when hardware limits you. Using UNetbootin to boot a live Linux environment from your hard drive opens the door to dual booting without extra hassle. Once comfortable, install Linux properly for the best experience—enjoy faster boots, better privacy tools, and a huge software library alongside Windows.