week4 Flashcards
Memory
capable of storing data and information on a temporary basis, memory is faster than stoarge, when the computer loeses the power data is lost
storage
physical storage devices, storage is slower then memory
when computer loses the power data is not lost
types of computer memory
1internal memory
2 extenal memory
internal memory
also called”main / primary memory” stores small amount of data that can be accessed quickly
external memory
Also called “secondery memory”
they could be embedded or removable storage devices
(Hard disk, solid state drive (SSD), USB flash drive)
internal memory classified into:
a. Volatile memory
b. Non-Volatile memory
volatile memory
once the system is turned off the data within the volatile memory is deleted automatically
(RAM)
Random Access Memorey (RAM)
also called (main/primary memory) the data is lost when the power is turned off
Ram types
1_ SRAM(static Random Access Memorey)
2_DRAM(Dynamic Random Access Memorey)
Static Random Access Memorey (SRAM)
it’s widely used in microprocessor, general computing application, volatile in nature
Dynamic RAM (DRAM)
it stores each data bit as an electrical charge within a single bit cell
it’s slower than SRAM
Non-Volatile memory
data or information is not lost whithin the memory even if power is shut down
(ROM)
hard drive (HD or HDD)
Non-Volatile data storage device attached directly to the computer’s motherboard
Solid State Drive (SSD)
designed to replicate or supplement the function of the hard drive
transistor-based
Stand alone units or hybrid drives
Solid State hybrid drive (SSHD)
physical storage device that combines a faster storage and a higher-capacity
the purpose of SSHD
improving the overall performance
Optical device
computer disk drive that reads and write data from optical disk through laser beaming technology
(DVD media, blu-ray discs)
flash drive
and types
also known as a USB flash drive, potable storage device
1_USB
2_card based drives
local Network Storage
and types
devices that allow for a single storage location
1_ Network-attached storage (NAS)
2_File server
Network-attached storage (NAS)
storage device connected to a network that allows storage and retrieval of data from centralized location for authorised network users and their client
File Server
computer attached to a network that provides a location for shared disk access
(txet, image, sound)
cloud storage devices
enable users to access their information and apps anywhere an internet connection is available
(google drive, Microsoft onedrive, apple icloud)
File system
in order for the OS to able to read and write files to a drive it must be partitiones and formatted
Partitoning is done to improve the performance (S28)
File system
-under windows
1_FAT(file allocation table):
maximum size of 32GB
2_ NTFS(New technology File system):
up to 2 TB
