By Akram Ali HARD DRIVE DISKS HDD What

By: Akram Ali HARD DRIVE DISKS (HDD)

What Are Hard Drive Disks? � Hard Drives are the main storage device for all the data on your computer � It is where you store all your files, documents and even your Operating System � They are often abbreviated as HDD or called Hard Drives � The Hard Drive is a storage device since it is used to store data.

History Of Hard Drives � Were invented in 1950 � Often called “fixed disks” which was a codename for the IBM product � They were very large measuring up to twenty inches in diameter � Later they were given the name “Hard Drive” to differentiate them from Floppy Disks

Early Hard Drives

Diagram Of The Hard Drive

Parts of The Hard Drive � Spindle- The shaft that rotates in the middle of the hard drive. Is attached to the platter. � Platter- A round magnetic plate inside the hard drive. There are many platters in a hard drive. � Actuator & Actuator Arm- Is the part of the hard drive where the read/write head attaches.

Parts of The Hard Drive Cont. � Read/Write Head- Is a instrument that read or writes data on to a magnetic plate � Logic Board- A circuit board that controls the Hard Drive and its functions � SATA Power Connecter- Provides electricity to hard drive so that it may operate

Parts of The Hard Drive Cont. � SATA Data Connector- Allows the hard drive to communicate with other parts of the computer and transfer data � SATA: Serial Advanced Technology Attachment. It is bus interface that allows the connecting of mass storage devices.

A Hard Drive In Operation

Specifications � Capacity: Is how much data the hard drive can store (ex. 500 GB) � Rotational Speed: Measured in rotations per minute(RPM). It is how fast the spindle inside the hard drive can rotate per minute (ex. 7200 RPM) � Seek Speed: Measured in milliseconds, it is the amount of time it takes for a hard drive to find a specific piece of data

Specifications � Interface: Is the connector that is used for the hard drive to interface with the computer. (ex. PATA, SATA, USB) � Buffer: Is buffer memory that loads information that the processor is likely to ask for. This will keep the data flowing smoothly.

Future Trends � Hybrid Hard Drives: Is a hard drive that holds all the components in a traditional hard drive. However, now a small Solid State Drive has been integrated into it. Seagate, the manufacturer of the hard drive, claims that the Hybrid Hard Drive can be up to three times faster than a traditional hard drive.

Additional Information 2011 Thailand Flooding Hard Drive Manufacturers have risen the prices by 20 to 40 percent, due to flooding. � In Thailand, which is the second highest exporter of hard drives in the world was flooded damaging many of the factories and killed 377 people since July 2011. � Western Digital predicts that it will not have production back to pre-flood levels until the third quarter of 2012. � This has caused the price of computers to increase and decrease sales all over the technology industry. �

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