Darwin 8.0.1 introduced support for HFS+ case-sensitive filesystems . While standard Mac OS X installations remained case-insensitive by default to maintain backward compatibility, this feature was crucial for server environments and Unix/Linux interoperability.
For users booting the Darwin 8.0.1 ISO, the experience was starkly different from the polished Aqua interface of Mac OS X. Booting into Darwin presented a text-based command-line interface (CLI). darwin 8.0.1 iso april 2005
Today, the Darwin 8.0.1 ISO serves primarily as an artifact for computing historians, retro-computing enthusiasts, and researchers interested in the evolution of the XNU kernel and the mechanics of early 2000s Unix development. Darwin 8