memory and storage

moving binary values left or right

-high speed

-volatile (temporary)

-main memory on computer

-when it boots up operating system is copied from secondary storage to RAM

-when applications, files, etc are opened they are copied from secondary storage to RAM

-RAM is faster than secondary storage

-secondary storage (not primary)

-not physical

-stores data which is not in use to free up the RAM

-moves the data back and forth from the virtual memory to the RAM as and when the data is being used

fundamental part of a computer. contains all of the instructions that the CPU follows.

-read only memory

-non-volatile

-contains the instructions to run the BIOS (basic input output system)

data is only kept when data

-solid state

-non volatile

-ability to be electronicallu reprogramed and erased

-often found in USB flash drives, MP3 players, digital cameras and solid-state drives

-long term storage

-refers to the hard drive

-non-volatile

-holds more data than main memory

-stores data which is not in use

how much space is there to store files?

e.g Cd, Dvd

uses a laser light to write to the disk using a pattern

magnetic strip such as floppy disc. are read using a moving head inside the disk drive. the tape is read sequentially (beginning to end)

-SSD (solid state drive)

-no moving parts

-fastest read/write speed

-referred to as flash memory e.g USB

how quickly can the computer read data from the storage device and write data to it

can you easily unplug it and carry it away?

how easily it is to damage? will it surivie dropping

how long it will last

storage decides vary in cost per Gb

-saves data in an off-site storage system

-not physical

-e.g icloud, dropbox

-via the internet

-includes own security, backups, log ins

binary digit, the smallest unit of data store by a computer. each bit is represented by a binary number 1= true or 0= false

4 bits, two nibbles would be equal to a byte

contains 8 bits e.g 11001010

1KB = 1,000bytes

1MB= 1,000KB= 1,000,000 bytes

1 GB = 1,000 MB= 1,000,000 KB = 1,000,000,000 bytes

1 TB = 1,000 GB = 1,000,000 MB= 1,000,000,000 KB = 1,000,000,000,000 bytes

1 PB= 1,000 TB= 1,000,000 GB = 1,000,000,000 MB= 1,000,000,000,000 KB = 1,000,000,000,000,000 bytes

128 64 32 16 8 4 2 1

0 (flase) and 1 (true)

0-9 is denary and A- 10, B-11, etc

any options on the keyboard. unit of information.