Primary Computer Storage Devices

The primary storage devices for computers are actually a part of the computer's memory. We have previously used the terms like RAM and ROM, but may not have know what they are exactly. They are the Random Access Memory (RAM) and Read Only Memory (ROM).

Random Access Memory
Random Access Memoryis used for storing information temporarily. When the computer is switched off, the information on the RAM is wiped off. The access rate of RAM is much higher. They are more expensive than the other types of primary storage devices.

Read Only Memory
It is used to permanently store data. Data can be stored on ROM, either when the computer is being manufactured or by the computer user. However, the disadvantage of this type of memory is that the data stored on ROM cannot be changed. The access rate necessary to get to the memory is much lesser as compared to the access rate of the RAM. Unlike the RAMs, ROMs are not expensive.

Secondary Computer Storage Devices

Most of the storage devices we are acquainted with, come under this category. They are not a part of the processor. People make use of these devices, so that the storage capacity of the computer can be increased. Like the ROM, the secondary computer storage are also non volatile. The information stored on these devices is retained, even if the computer has been switched off.


Types of storage devices

Floppy Drive- The smallest and most portable of all the storage devices usually holds about1.44 MBof storage. Use a floppy disk media.

Super Drive
The LS120 or SuperDisk is a drive which supports a special floppy diskette which can store up to120MB or 240MBof information as well as being backwards compatible and still supporting the standard floppy diskettes.

Zip Drive
New generation similar to the floppy disk drive created by Iomega The Iomega Zip Drive was first released 1994 and today is becoming a popular solution for PC and Macintosh computers as a removable solution. Zip Drives Disks come in100MB, 250MBand750MB

CD BurnerAn optical storage device that holds data anywhere from650MB to 700MB(74-80 minutes)

Dvd Burner- A newer optical storage device that holds data anywhere from4.70-17.08GB

DVD Capacity

DVD-5 4.7GB (2 hours)
DVD-9 8.54GB (4 hours)
DVD-10 9.4GB (4.5 hours)
DVD-18 17.08GB (8 hours)

Newest DVD format

Blu-Ray DVD 25-50GB
HD-DVD 15-30GB

Hard Drive- A hard drive is usually built inside your computer and holds anywhere from1GB to 4TBof capacity. There are three types of internal hard drives are PATA, SATA and SCSI. External hard drives comes in USB, Firewire, SATA and SCSI.

Flash Drive- A compact and portable device use for storing data anywhere from 128MB up to 4GB.

Tape Drives

Tape drives allow large companies as well as end users to backup large amounts of data. Tape drives are capable of backing up a couple hundred megabytes to several gigabytes of information without having to spend large sums of money on disks.

Tape Drive Standards

8mm Tape Drive- Manufactured and available through Exabyte 8mm tapes are similar to what are used in camcorder. 8mm tapes are a faster solution then the DAT and transfer up to 6M/Sec. While the tapes are similar to camcorder tapes it is recommended that to backup information you use 8mm tapes designed for your drive.

DAT (Digital Audio Tape)- Digital Audio Tape is primarily developed and marketed by Hewlett-Packard. DAT drives use two types of data formats DDS (Digital Data Storage) and DataDAT. DDS Drives are available in three types DDS-1/2/3.(36-72GB)

DLT (Digital Linear Tape)- DLT drives are a robust and durable medium. The DLT segments the tape into parallel horizontal tracks and records data by streaming the tape across a single stationary head. Released in 1991 DLT drives are very reliable, high-speed, and high-capacity making the DLT drives an excellent use for Network backups.(330-600GB)

AIT - Advance Intelligent Tapes (100-260GB)

Travan- (8GB-20GB)

LTO-Linear Tape Open (200-400GB)
Advance Storage

NAS -Network Attachment Storage

SAN- Storage Area Network

SET (Maharashtra) Examination 16th April 2017

1 Commencement of online Application 27 Dec 2016
2 Last date for Applying Online 10 Jan 2017
3 Availability of Admit Card on website 06 Apr 2017
4 Date of Examination 16 Apr 2017


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