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Login to unlockChapter 12: Mass Storage System
Created: 2025-12-16
Updated: 2025-12-16
Disk Structure
- disk drives are addressed as large 1-dim arrays of logical blocks
- platter -- track -- sector
- logical block (sector) mapped onto disk sequentially
- Sector 0: Platter 0, Track 0, Sector 0
- go from
outermost tracktoinnermost track
- Sector Per Track
- CLV (Constant Linear Velocity)
- density of bits per track is uniform, keep same data rate
- rotational speed varies; the inner, the faster
- CAV (Constant Angular Velocity)
- rotational speed is constant
- density varies; the inner, the higher
- CLV (Constant Linear Velocity)
Disk Scheduling
- Disk Access Time
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