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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.

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.

1.World's first computer is ENIAC . 2.World's fastest computer Sunway    Taihulight  LINPACK  benchmark  score of 93  PFLOPS.      3.World's smallest computer      is  the  Michigan Micro Mote  (M^3) is the  smallest  autonomous  computer in the  world. 4. World's  most expensive gaming  computers in the world is  8Pack    OrionX – $30,000 . 5.World's largest computer ever built is   SAGE (semi-automatic ground    environment).