It added "early" support for things like USB 3.0 and newer storage controllers, keeping aging 2007-era software compatible with 2011-era hardware. 🛡️ The Legacy
The process involves generating a cryptographic "fingerprint" (a checksum) of the downloaded ISO and comparing it to the official checksum provided by Red Hat in the Customer Portal. red hat enterprise linux 5.7 x64 iso 84
The legacy RHEL splash screen will appear. Press to run the graphical installer, or type linux text and press Enter for a command-line setup. It added "early" support for things like USB 3