Module 1: Basics and Background
  Lecture 4: Memory and Disk Accesses
 

                                            

 

Disk capacity

Capacity=(#bytes/sector)x(#sectors/track)x(#tracks/surface)x(#surfaces/platter )x(#platters/disk)
  • Example
 
  • 1024 bytes / sector
 
  • 400 sectors / track
 
  • 20000 tracks / surface
 
  • 2 surfaces / platter
 
  • 5 platters / disk
 
  • Capacity10244002000025 bytes80 GB