September 22nd, 2016. Thursday.
Today in class Ms.Wan taught a new chapter. This chapter is quite an interesting chapter. Storage holds data, instructions, and information for future use. A storage medium is the physical material on which a computer keeps data, instructions, and information.
Capacity is the number of bytes a storage medium can hold. Storage are separated into Terms.These Terms may be referred in kilobytes, megabytes, gigabytes, terabytes, and many more.
A storage device is the computer hardware that records or retrieves items to and from storage media. Two functions often carried out by this storage device are reading and writing. Reading is the process of transferring items from a storage medium into memory. Whereas writing is the process of transferring items from memory to a storage medium.
The access time of a storage device is the amount of time it takes to locate an item on a storage medium. The access time may also be referred to as the time required to deliver an item from its memory to the processor.
Hard Disk
A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information. A hard disk could store data using longitudinal recording or perpendicular recording.
There are many characteristics of a hard disk, some includes the capacity, the platters, the revolutions per minute, the access time, and many more.
Formatting is the process of dividing the disk into tracks and sectors so that operating system can store and locate data and information on the disk.
RAID (redundant array of independent disks) is a group or two or more integrated hard disks. A network attached storage (NAS) device is a server connected to a network with the sole purpose of providing storage.
There are different types of hard disk, such as an external hard disk, which is a separate free-standing hard disk that connects to your computer with a cable or wirelessly. A removable hard disk on the other hand, is a hard disk that you insert and remove from a drive. Note that internal and external hard disk are available in miniature sizes.
Flash Memory Storage
Flash memory chips are a type of solid state media and contain no moving parts. Solid state drives (SSDs) have several advantages over hard disks, such as a faster access time, faster transfer rates, last longer, generate less heat and consumes less power.
A memory card is a removable flash memory device that could be inserted and removed from a slot in a computer, mobile device, or card reader/writer.
An Express-card module is a removable device that fits in an Express-card slot. This device is developed by thhe PCMCIA, most commonly used in notebook computers.
Cloud Storage
Cloud storage is an Internet service that provides storage to computer users.
Optical Discs
An optical disc consists or a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser. Typically store software, data, digital photos, movies, and music.
This laser reads on an optical disc based on 3 simple steps. Step 1, a laser diode shines a light beam toward the disc. Step 2, if light strikes a pit, it scatters. If light strikes a land, it is reflected back toward the laser diode. And for the final step, the reflected light is deflected to a light-sensing diode, which sends a digital signal of 1 to the computer. Absence of reflected light is read as a digital signal of 0.
Optical discs commonly store items in a single track that spirals from the center of the disc to the edge. The track is normally divided into evenly sized sectors.
Other Types of Storage
- A magnetic stripe card contains a magnetic stripe that stores information. A smart card stores data on a thin microprocessor embedded in the card.
- Microfilm and microfiche store microscopic images of documents on a roll or sheet film.
- Enterprise storage stores huge volumes of data and information for large business.
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