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A h ard d isk d rive (HDD), hard disk, hard drive or fixed disk is a data storage device that uses magnetic storage to store and retrieve digital information or data using one or more rigid rapidly rotating disks (platters) coated with magnetic material.   Even your operating system is stored on your computer's hard drive. Hard-disk is a non-volatile memory. SATA drive are commonly used. Types of HDD : IDE:Integrated Drive Electronics. drives it is also known  as PATA.   SATA : Serial advance technology attachment. SCSI : Small Computer System Interface. SAS : Serial Attached SCSI.

The full form of INTERNET is I nternational N etwork.  definition of Internet it is a global communication network that allows almost all computer worldwide to  connect and  exchange   data and information . the Internet is the largest network of networks . it connects millions and billions of computer together globally.  with the help of Internet, a computer can communicate and connect with any other computer as long as they both connected to the internet.

SanDisk released the world's highest capacity microSD card  which is 400GB. Capacity: 400gb Read Speed: up to 100MB/s Video Speed: C10, U1, A1 Form Factor: microSDXC Cost of it $250 (estimate) Price is not decided yet, the price may differ  it depends on country to country.

there are five basic ROM types: 1. ROM -  read Only Memory. 2.PROM - Programmable Read Only Memory. 3.EPROM - Erasable Programmable Read Only Memory. 4.EEPROM - Electrically Erasable Programmable Read Only Memory. 5.FEEPROM - Flash  Electrically Erasable  Programmable Read Only Memory.

It was released to the public on August 21, 2017. Android O (O means  "Oreo" ). Smarter, Faster & more powerful. 2x faster. Minimize background activity. Auto fill. Picture in picture(allows to see two app at once). Do two things at once, at once. Notification Dots: Press the notification dots to quickly see what's new. Google play protect. 60 new emoji.