Why Was There a 504MB Barrier (And How I Broke It on My 386)

Why did older computers suddenly stop recognizing hard drives larger than 504MB? In this video, we dive into the history of the infamous 504MB barrier, explaining the clash between CHS cylinder limits in BIOS and the IDE interface, before building a custom translation layer and modifying the BIOS to break the limit on a vintage AMD 386 DX40! BUBios got an entry next to AWARD and AMI on The Retro Web: https://theretroweb.com/motherboards/... SOYO SY-019L1 BIOS: https://github.com/BitsUndBolts/SOYO_... Link to the BUBios Repo (BIOS collection): https://github.com/BitsUndBolts/BUBio... ▬▬▬▬ Support Bits und Bolts ▬▬▬▬▬▬▬▬▬▬ Patreon:🔸  / bitsundbolts   Buy Me A Coffee:🔸https://buymeacoffee.com/bitsundbolts Bitcoin: bc1q2dvf9flf78lam33qjj9w9xgvfxdgre7g9x3rmw Twitter/X:🔸  / bitsundbolts   Facebook:🔸  / bitsundbolts   Website:🔸https://bitsundbolts.com/ ▬▬▬▬ Affiliate Links ▬▬▬▬▬▬▬▬▬▬▬▬▬ Visit my website to find affiliate links to most of the tools and products I use 🔸https://bitsundbolts.com/affiliate/ Thank you for your support! ▬▬▬▬ Timestamps ▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 00:00 In this video 00:30 SOYO SY-019L1 BIOS 03:38 CHS 08:22 The 504MB Limit 10:50 504MB Barrier Theory 17:58 ECHS 21:30 Sneak Peek