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中科大操作系统原理与实现课件12_MassStorageSystems1
操作系统原理与设计
第12章 Mass-Storage structure (外存)
陈香兰
中国科学技术大学计算机学院
2009年09月01 日
. . . . . .
提纲
Overview of Mass Storage Structure
Disk Structure
Disk Scheduling
Disk Management
Swap-Space Management
小结和作业
. . . . . .
Overview of Mass Storage Structure I
Magnetic disks provide bulk of secondary storage of modern
computers
Drives rotate at 60 to 200 times per second
Transfer rate is rate at which data flow between drive and
computer
Positioning time (random-access time) is time to move disk
arm to desired cylinder (seek time) and time for desired sector
to rotate under the disk head (rotational latency)
Head crash results from disk head making contact with the
disk surface
That ’s bad
Disks can be removable
. . . . . .
Overview of Mass Storage Structure II
Drive attached to computer via I/O bus
Busses vary, including EIDE, ATA, SATA, USB, Fibre Channel,
SCSI
Host controller in computer uses bus to talk to disk controller
built into drive or storage array
. . . . . .
Overview of Mass Storage Structure (Cont.)
Magnetic tape
Was early secondary-storage mediu
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