Disk Drive Implimentation

Upon completion of this lesson, you will be able to :

• List and discuss various disk drive components

– Platter, spindle, read/write head and actuator arm assembly

• Discuss disk drive geometry

• Describe CHS and LBA addressing scheme

• Disk drive performance

–Seek time, rotational latency and transfer rate

• Law’s governing disk drive performance Enterprise flash drive

Disk Drive Components

Physical Disk Structure

Logical Block Addressing

Disk Drive Performance

• Electromechanical device

– Impacts the overall performance of the storage system

• Disk Service Time

– Time taken by a disk to complete an I/O request

Disk service time =Seek time + (rotational delay/speed in RPM)+ (block size/transfer rate)

• Seek Time

• Rotational Latency

• Data Transfer Rate