Storage

Storage Technology

Electronic devices that store, retrieve, and save instructions and data.

Today’s microcomputers or PCs include several types of storage devices.

Capacity and speed are important considerations when selecting a new storage device for a PC.

Storage Technology Magnetic storage devices

store data by magnetizing particles on a disk or tape. They have a limited life-span of 1 to 5 years, depending on the device.

Magnetic storage is non-volatile Ex: Hard drive

Optical storage devices store data as light and dark spots on the disk surface. stores information in deformities on the surface of a circular disc and reads this information by illuminating the surface with a laser diode and observing the reflection

Optical disc storage is non-volatile Ex: CD CDROM. DVD

Storage Technology

Semiconductor :- uses semiconductor-based integrated circuits to store information. A semiconductor memory chip may contain millions of tiny transistors or capacitors. Both volatile and non-volatile forms of semiconductor memory exist

RAM For volatile non-volatile semiconductor memory known

as flash memory

Storage DevicesComputer storage devices :  The storage devices are one of the

most important components of the computer system, these devices that are used in the computers to store the data. computer has many types of data storage devices. Some of them can be classified as the removable(flash Memory, external hard, Floppy Disk) data Storage Devices and the others as the non-removable (RAM, Internal Hard)data Storage Devices.

The data Storage Devices also come in many sizes and shapes.

Cont. Device storage either volatile memory or non-

volatile memory, volatile memory is the kind of the memory that

is erasable and the non volatile memory is the one where in the contents cannot be erased. Example : Primary memory such as RAM , Cache (Volatile) Secondary Memory such as Hard Disk, Flash

memory (Non-volatile) Therefore non volatile much:-

Cheaper Slower

Storage Technology

Electronic devices that store, retrieve, and save instructions and data.

Today’s microcomputers or PCs include several types of storage devices.

Capacity and speed are important considerations when selecting a new storage device for a PC.

Storage Technology Magnetic storage devices

store data by magnetizing particles on a disk or tape. They have a limited life-span of 1 to 5 years, depending on the device.

Magnetic storage is non-volatile Ex: Hard drive

Optical storage devices store data as light and dark spots on the disk surface. stores information in deformities on the surface of a circular disc and reads this information by illuminating the surface with a laser diode and observing the reflection

Optical disc storage is non-volatile Ex: CD CDROM. DVD

Storage Technology

Semiconductor :- uses semiconductor-based integrated circuits to store information. A semiconductor memory chip may contain millions of tiny transistors or capacitors. Both volatile and non-volatile forms of semiconductor memory exist

RAM For volatile non-volatile semiconductor memory known

as flash memory

Storage Devices

Hard Disk Drives Capacity is measured in gigabytes (GB or billions of bytes). Typically permanently installed. Used to store operating system, application software, utilities

and data. Magnetic storage device.

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Storage Devices

CD-ROM Drives Typically installed on all new computer

systems. (Were add-on device until the mid 1990’s).

Capacity is 600 to 750 megabytes (MB or millions of bytes).

Most mass-produced commercial software is packaged on a CD.

RAM (Random Access Memory)

“Waiting room” for computer’s CPU. Holds instructions for processing data,

processed data, and raw data. Ram is measured by:

Capacity (in Megabytes or Gigabytes) Speed (in Nanoseconds)

Magnetic tape

Semiconductor

Optical disk