Standard Windows 7 doesn't recognize NVMe SSDs. Patched versions include the necessary updates (KB2990941 and KB3087873) to allow installation on modern storage.
The installation file is usually small enough to fit on a CD (under 700MB), rather than a DVD. Why Look for an "ISO Patched" Version? i tiny7 iso patched
While a standard Windows 7 installation might take up 10GB to 15GB of disk space and idle at 500MB+ of RAM, iTiny7 is a different beast: Standard Windows 7 doesn't recognize NVMe SSDs
The Ultimate Guide to iTiny7: The Lightweight, ISO-Patched Windows 7 for Older Hardware Why Look for an "ISO Patched" Version
These ISOs are created by third parties. Always ensure you are downloading from a reputable community source to avoid pre-installed malware. How to Install iTiny7 ISO Patched
iTiny7 is a highly customized distribution of Windows 7 Ultimate. The goal of the original creators was to strip away every non-essential component of the OS to reduce its resource consumption.