Concepts related to mechanical disks: track, cylinder, sector, track seeking time, rotation delay, and data transmission time

Source: Internet
Author: User
(I) Track

The circle is centered on the disc and different radius are used to divide different narrow circular areas.

(Ii) slice

Each track on the disk is divided into several arc segments, which are the disk sectors. The sector is the smallest physical storage unit of the disk.

(Iii) cylindrical

A cylindrical Ring Wall Composed of tracks with the same radius in the upper and lower disks is called a cylindrical


The previous image is more intuitive

(Iv) Seek time

HeadMove from start to Data LocationTrackRequired Time
The shorter the tracing time, the faster I/O operations. Currently, the average tracing time of a disk is generally 3-15 ms,The current server can be 3 ms

(V) Rotation Delay

Disk rotation stores the requested dataSliceMove to read/writeHeadTime required below
Rotation delay depends onThe disk speed and current server can reach 15000 rpm

(Vi) data transmission time

The time required to transmit the requested data


Summary:

From the above indicators, the most important thing is that we are most concerned about only two:

● Seek time

● Rotation Delay

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.