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Ultra-resource-constrained hardware and embedded systems. 2. Puppy Linux (~300MB - 400MB) Linux Operating System Highly Compressed
If you are building a custom bootable tool, is the industry standard. It’s a read-only compressed filesystem that can achieve compression ratios of up to 5:1. Strip Down the Kernel Carry a full Swiss-Army-Knife repair OS on a keychain
Several Linux distributions are known for their highly compressed nature: Linux Operating System Highly Compressed