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Explain the flash memory devices and Blu-ray disc.

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Flash Memory Devices:

Flash memory is an electronic (solid – state) non – volatile computer storage medium that can be electrically erased and reprogrammed. They are either EEPROM or EPROM. Examples for Flash memories are pendrives, memory cards etc. Flash memories can be used in personal computers, Personal Digital Assistants (PDA), digital audio players, digital cameras and mobile phones. Flash memory offers fast access times. The time taken to read or write a character in memory is called access time. The capacity of the flash memories vary from 1 Gigabytes (GB) to 2 Terabytes (TB). 

Blu – Ray Disc:

Blu – Ray Disc is a high – density optical disc similar to DVD. Blu-ray is the type of disc used for PlayStation games and for playing High – Definition (HD) movies. A double – layer Blu – Ray disc can store up to 50 GB (gigabytes) of data. This is more than 5 times the capacity of a DVD, and above 70 times of a CD. The format was developed to enable recording, rewriting and playback of high – definition video, as well as storing large amount of data. DVD uses a red laser to read and write data. But, Blu – ray uses a blue-violet laser to write. Hence, it is called as Blu – Ray

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