Why do updates take so much storage

Overview

Software updates consuming substantial storage has become increasingly prominent since the 2010s as operating systems grew more complex. Windows 10's 2015 release marked a shift toward larger, more frequent updates, with Microsoft's "Windows as a Service" model requiring regular major updates. By 2020, Windows 10 updates averaged 3-6GB for feature updates. Apple's macOS updates similarly expanded, with macOS Big Sur in 2020 requiring 35.5GB for installation. This trend reflects the transition from simple security patches to comprehensive system overhauls that include new features, security enhancements, and compatibility improvements. The storage demands have accelerated with the rise of 64-bit architectures, high-resolution assets, and expanded system libraries that now include machine learning frameworks and advanced graphics components.

How It Works

Updates consume storage through several mechanisms: complete file replacement, temporary installation files, and rollback protection. Modern operating systems typically replace entire system components rather than patching individual files - for instance, Windows Update downloads complete new versions of system files (like ntoskrnl.exe) rather than modifying existing ones. During installation, systems create temporary copies (Windows uses a Windows.old folder containing 20-30GB of previous system files) to enable rollback if issues occur. Additionally, updates often include multiple architecture versions (x86 and ARM for Windows, Intel and Apple Silicon for macOS) within the same package. The update process also reserves space for future updates through mechanisms like Windows' Reserved Storage (typically 7GB) and macOS's purgeable space. Compression helps but is limited since many system files must remain uncompressed for boot-time accessibility.

Why It Matters

Storage-intensive updates significantly impact device usability and longevity. For users with devices having 32GB or 64GB storage (common in budget devices and older smartphones), large updates can consume 25-50% of available space, forcing deletion of personal files or apps. This contributes to planned obsolescence, as devices with limited storage become unusable for updates years before hardware failure. The storage requirements also affect update adoption rates - devices with insufficient space cannot install critical security patches, creating vulnerabilities. From an environmental perspective, premature device replacement due to storage constraints increases electronic waste. Manufacturers have responded with cloud-based update components and smarter storage management, but fundamental architectural choices continue driving substantial local storage needs.