Storage
Categories of Storage Primary Storage (Volatile) Secondary Storage (Non-Volatile) Tertiary & Offline Storage Cloud Storage Key Characteristics Feature HDD SSD RAM Cloud Volatility Non-volatile Non-volatile Volatile Non-volatile Speed Slow (100 MB/s) Fast (500 MB/s–7 GB/s) Very fast (10–100 GB/s) Depends on internet Cost per GB Low Medium–High High Subscription-based Durability Mechanical wear No moving parts Not for storage Depends on provider Use Case Mass storage OS, apps, games Active processing Backup, sync, access anywhere Storage Hierarchy (Fastest to Slowest) Storage Capacity Units
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