Un Interruptible Power Supply

Un Interruptible Power Supply or simply UPS, are now the essential part of the daily life in the countries where Power Failure is very common. In the beginning the UPS were very expensive so they were used only with the very expensive equipment which requires continuous supply of power. As the UPS became cheaper its usage expanded and they became an essential piece of equipment for Data Centers and Business Computers UPS are also being used now with Personal Computers, Entertainment systems etc etc.

The size of UPS depends upon its capacity ,the capacity can be from 200 VA to many Hundered VA. Normally UPS are used with Dry Batteries but it depends on the user .Dry Batteries are used in it as they are maintenance free and no harmful fumes comes out of it. When wet batteries are used with UPS ,it must be understood that these wet batteries require maintenance and these are harmful for the health of humans when they are placed inside the room due to their harmful fumes.
By type they can be Off Line ,On Line and Line Interactive.Off Line UPS are normally cheap in price.

Computer Hard Discs

The storage of the data is a very critical task. Different medias are used for the storage of data like Floppy discs,Hard discs,Writable CDs, Writeable DVDS,Tape Drives ,DAT Drives etc. Hard discs or Hard Disc Drives or simply HDD were introduced in IBM Machines in 1956.

Now a Days HDD are also used in Digital Video Recorders , Digital Audio Players and ,Digital Cameras .It was 2005 when SAMSUNG AND Nokia used Hard Discs in Mobile Phones . To secure Data on Networks NAS (Network Attached Storage ) and SAN ( Storage Area Network ) Hard discs are used.

When you talk about form factor of HDD ,it means the size of the hard disc ,there are many sizes like in 1979 the size was 8 Inches ,then in 1980 Seagate introduced 5.25 Inches HDDs .In 1984 3.5 Inch Hard Drive was introduced . 2.5 Inch HDD was introduced by PrairieTek in 1988. Then for Digital Audio Players 1.8 Inch Hard Disc was introduced . Now a Days the smallest form factor is 0.85 Inch used for Mobile Phones.