Main spindle Head 0 Side 0 cylinder/head/sector Armfor head 1 Head stack assembly Head 2 Armfor Tracking/Alignment head Illustration of a hard disk http://www.microsoft.com/resources/documentation/windo wsnt/4/server/reskit/en- us/resguide/diskover.mspx?mfr=true 嵌入式系统实验室 EMBEDDED SYSTEM LABORATORY SUZHOU INSTITUTE FON ADVANCED STUDY OF USTChttp://www.microsoft.com/resources/documentation/windo wsnt/4/server/reskit/en￾us/resguide/diskover.mspx?mfr=true Illustration of a hard disk cylinder/head/sector