DAS NAS SAN : Understanding Data Storage Systems

Every single second, the world generates hundreds of terabytes of new data — photos, videos, messages, research, transactions, and AI-generated content. But where does all this data actually get stored? In this video, we’ll explore the three main types of data storage systems used today — DAS (Direct-Attached Storage), NAS (Network-Attached Storage), and SAN (Storage Area Network). We’ll look at how data flows from the application layer all the way down to the drives, and understand: How DAS connects directly to a computer’s motherboard (SATA, NVMe). How NAS makes data accessible over a local network using file-level access. How SAN enables enterprise-level block storage over fiber channel or high-speed Ethernet. You’ll see real hardware examples — from SATA drives and SSDs to enterprise-grade NAS and SAN racks — along with block diagrams that illustrate how data travels through each storage type (the software stack). 🧠 What You’ll Learn What makes DAS, NAS, and SAN different File-level vs block-level data access Why enterprises use NAS and SAN for performance scalability and reliability A peek at the software stacks used in DAS NAS and SAN Chapters: 00:00 – Intro 00:34 – Direct Attached Storage (DAS) 00:47 – SATA Storage Devices 01:45 – NVMe Drives 02:55 – USB Connected Storage 03:06 – NAS for Personal/Home Use 03:55 – Enterprise Data Storage 04:44 – Enterprise Grade Network Attached Storage (NAS) 06:43 – Enterprise Grade Storage Area Networks (SAN) 09:11 – The Software Stack 09:21 – DAS Software Stack 09:32 – NAS Software Stack 10:10 – SAN Software Stack 10:50 – In Summary