Simply connect the drive to your computer's USB port and install the OS just like you would from a CD or DVD. In some cases, you can purchase an operating system on a flash drive (such as Windows 10 and OS X Lion). In this case, using a USB flash drive might be your best option. Additionally, if you are installing an OS on a blank hard drive, you might not be able to use the download and upgrade method described above. If you don't have a fast Internet connection, downloading several gigabytes of data may not be a viable solution. After you download the latest OS, it will automatically begin the installation process. Simply open the "App Store" application (included in OS X 10.6 and later) and search for OS X. If you are a Mac user, you can download the latest version of OS X from the Mac App Store. You won't need to worry about mounting a disk image because Windows will begin the installation process automatically. If you are are already using Windows 7 or 8, you can download Windows 10 directly from Windows using the "Windows Update" feature.
You can then install the OS just like you would from a physical disk. When you double-click it, the disk image will mount on your desktop as a CD or DVD. When you manually download an operating system, it may be saved as a disk image (like an. For example, you can download Windows 7 from Microsoft's website here: Most major operating systems can now be downloaded directly from the software company. So how do you install an OS on a computer without a CD or DVD drive? You have two primary options: 1) download it, or 2) use a USB flash drive.
Now many computers, especially laptops, do not include an optical drive.
As the size of OSes grew, they no longer fit on CDs, so DVDs became the standard medium. Answer: For about ten years, CDs were the standard way to distribute operating systems.
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