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Secondary storage devices:

Secondary storage devices V cp Mayank labde Term 1 project


definition Secondary storage devices are devices which are externally connected to the computer , which extends the storage capacity. A secondary storage device refers to any volatile storage device that is internal or external to the computer. It can be any storage device beyond the primary storage that enables permanent data storage. A secondary storage device is also known as an auxiliary storage device or external storage. Secondary storage devices are primarily referred to a storage devices that serve as an addition to the computer's primary storage, RAM and cache memory. Typically, secondary storage allows for the storage of data ranging from a few megabytes to petabytes. These devices store virtually all programs and applications stored on a computer, including the operating system, device drivers, applications and general user data. Most of the secondary storage devices are internal to the computer such as the hard disk drive, the tape disk drive and even the compact disk drive and floppy disk drive.

Hard disk:

Hard disk A hard disk is a data storage device used for storing and retrieving digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material. The platters are paired with magnetic heads arranged on a moving actuator arm, which read and write data to the platter surfaces. The platters are coated with magnectic material and each platter consists of a number of invisible circles called tracks. Data are recorded on these tracks in the form of tiny magentic spots. The presence of a magnetic spot represents the bit '1' and its absence represents the bit '0'. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. Hard disks are a type of non-volatile memory, retaining stored data even when powered off.

Floppy disk:

Floppy disk A floppy disk, also called a floppy, diskette or just disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles. In addition to storing data, it can also be used to transferring from one computer to another. Floppy disks are read and written by a floppy disk drive (FDD). This storage device, though very popular at one time, is now hardly used and is replaced by CDs and DVDs.

Cd - rom:

Cd - rom A CD-ROM (Compact Disk Read Only Memory) also consists of tracks and sectors it can store up to 700 MB of data. CD-ROMs are available in two main forms: CD-R (compact disk recordable): Data once written on to it cannot be erased; it can only be read. CD-RW (compact disc rewritable): Data once written onto it can be erased to write or record new data many times . It is also called an erasable CD. To use a CD-ROM , a device called a CD-ROM drive is needed.

Pen drive / FLASH DRIVE:

Pen drive / FLASH DRIVE A USB flash drive (USB stands for Universal Serial Bus) is a popular way to store digital information. Flash drives are an easy way to share data (information). A USB flash drive can be attached to a USB port, and provides a certain amount of storage space, which can be used to store data. USB flash drives are used with devices found in homes, workplaces and schools. They are called "Flash drive" because they use flash memory to store files. Flash memory is a type of computer chip. Other common names for a flash drive include: memory stick, memory card, flash stick, keydrive, pendrive, thumbdrive and jumpdrive or simply USB. USB flash drives have some advantages over other portable storage devices. They are physically much smaller and more rugged than floppy disks. They store and read much more data, much faster than floppy disks. Floppy disks have become obsolete because of this.

Dvd (digital video/VERSATILE disk):

Dvd (digital video/VERSATILE disk) DVD ("digital versatile disc" or "digital video disc") is a digital optical disc storage format invented and co-developed by Philips, Sony, Toshiba, and Panasonic in 1995. The medium can store any kind of digital data and is widely used for software and other computer files as well as video programs watched using DVD players. DVDs offer higher storage capacity than compact discs while having the same dimensions. It looks similar to CD. To use a DVD, a device called a DVD-ROM drive is needed.

Blu–ray disC:

Blu –ray disC Blu-ray or blu-ray is a digital optical disc data storage format. It was designed to supersede the DVD format, in that it is capable of storing high- and ultra high-definition video resolution. Blu-ray Disc is a high-density optical disc format similar to DVD. Blu-ray is the type of disc used for PlayStation 3 games and for playing high-definition (HD) movies. In the past, there were other standards for such movies, such as the HD DVD format. Blu-ray won what is called the format war. A dual-layer Blu-ray disc can store up to 50GB (gigabytes) of data. This is over five times the capacity of a DVD, and over 70 times more than a CD or VCD.



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