Page 75 - DCAP101_BASIC_COMPUTER_SKILLS

Basic Computer Skills

Notes
getting bigger and bigger, ultimately making this drive a very popular and
successful.
Currently 1 GB USB flash drives are available, and bigger drives are on the horizon.
(Interestingly HDD popular as of now is of 160GB and more).
Card Media (SD/MMC/MS)
It it that stamp sized media that became popular from portable devices like Cameras
and Phones. Media started shrinking and its capacity always increasing. One can locate
a 8 GB Micro SD Card at a reasonable price these days. It uses the same technology
as the USB Drive internally, only the interface is differing in order for it to be used
by various devices like Camera and Mobile Phones. Now days Card Reader for these
type of media are getting shipped as a standard accessory from leading Computer
manufacturers.
Portable USB HDD
As mentioned above this is also getting popular and is popular mainly for higher speed
and capacity than what is currently provided by the USB flash drive. On the flip side it
is still fragile (as having moving element) and bulkier than the flash drive.
Solid State Disk (SSD) having USB Interface

This is a semiconductor (like flash memory) based persistent data storage device that is
having no moving parts inside, hence Solid State Disk. It emulates a Hard Disk Drive
Interface with added bonus being more robust, faster, quieter, less space and power
requirement, as compared to any hard disk drive.
These devices have started to find way into high end Laptops and Computers (like Sony
Vaio TZ Series). Though costly right now, it may become a standard secondary storage
medium in the coming years.

Holographic Drives
Last but not the least is the future. This is the media of the future that uses technology
that is still in its infancy and is called holography. Though holography and holograms
are nothing new and was discovered in late 1940s, but its application for data storage
is new. A company called In Phase Technologies is one of the forerunners in this field
that has prototyped disks that can hold 200GB to 1.6TB of data. This technology uses lasers
for reading and writing of data.

Questions:
1. Explain the working of Paper Punch Card.

2. How to Portable USB HDD in computer?

4.5 Summary

• Secondary storage is a hard disk that save more data in computer.
• Hard disk is secondary storage services.
• Input device means that provide the input from user side in the computer.

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