Component,Hard,Disk,Drive,Norm computer Component of a Hard Disk Drive
Gone are those times when the companies and the organisations didn't need a hi-tech system to handle them. Owing to the considerable increase in the business sector and thus, an enormous increase in the complexity of the organisational struc ----------------------------------------------------------Permission is granted for the below article to forward,reprint, distribute, use for ezine, newsletter, website,offer as free bonus or part of a product for sale as longas no changes a
Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.0pt;font-family:"Times New Roman";mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;}Components used in HDD can be broadly classified into4 categories magnetic components, mechanical components, electro-mechanicalcomponents, and electronics. In hard disk drive, information bits are stored inconcentric data tracks on a rotating disk coated with magnetic media. Theinformation is recorded as well as retrieved using the read/write head.Practical realization of such non-volatile storage and retrieval of binarybits, however, involves many other essential components, e.g., a motor to spinthe disks, an actuator to make read/write head access the desired data etc. Head and Disk Data is recorded on a continuously spinning disk madeof aluminum or glass and coated on both sides with a thin layer of magnetic material.The disk is mounted through a hole at the center on the shaft (spindle) of amotor that spins the disks. In desktop application, the disks are spun at 6,000or 7,200 RPM. The spinning speed can be 10,000 RPM or beyond in highperformance HDD. Disk is coated with several layers of other materials. Electromechanical Components Two different electromechanical components are usedin a hard disk drive - (1) a spindle motor to spin the disk or disks and (2) anactuator to re-position the read-write heads on the desired data track and tomaintain its position precisely over the track while data is being read orwritten. Mechanical and Electronic Components The drive enclosure is the external casing of thehard disk drive. It provides features for mounting the drive in the drive bayof the host system, and supports other components of the HDD such as spindlemotor, actuator, PCB etc. There are two parts of the enclosure - top cover andbase plate. All components are assembled on the base plate. Electronic components of an HDD can be categorizedaccording to the following functions:1. Electronics for reading/writing also known as thechannel electronics.2. Electronics for spinning the disks and positioningof the read/write head also known as the servo channel.3. Electronics for controlling various operations(such as read data, write data, transfer data between HDD and host etc) of thedisk or the disk controller.4. Electronics for interface with the host system.5. RAM, ROM etc.
Component,Hard,Disk,Drive,Norm