A451: Hardware - Secondary Storage Flashcards
What is Flash memory?
-Flash Memory is often referred to as solid-state storage, which means that there are no moving parts. It’s similar to RAM but is non-volatile which means when the power is cut off, it still remembers the content). Flash memory is used in USB memory sticks and memory cards for digital cameras and some games consoles.
Why is data represented as binary in computers?
-Computers use binary as it’s a lot simpler. Each CPU is made up of millions of transistors which can only have two states (ON/OFF). Anything can be converted into a binary number so a computer can understand, process and store it.
Why do we need secondary storage?
-Secondary storage is needed for when we want to store files permanently or semi-permanently. We might want to transfer files between computers by using portable secondary storage media.
What are the three most common storage techniques?
- Optical - codes data using microscopic dips on the surface of the disk.
- Magnetic - Codes data using small changes in magnetic fields
- Solid state - Uses non-volatile memory chips to store bis of data, expensive but very fast.
Arrange in order the terms of storage?
- Bit, nibble(4 bits), Byte(8 bits), Kilobyte (1,024bytes), Megabyte (1,024kilobytes), etc.. gigabytes and terabytes.
How does optical storage work?
- Codes data using microscopic dips on the surface of the disc.
How does magnetic storage work?
-Codes data using small changes magnetic fields.
How does solid-state memory work?
-Uses nonvolatile memory chips to store bits of data.
Properties of flash memory or devises?
-Solid-state storage direct access more expensive per bytes then hard disk expensive very portable very durable very reliable.
Properties of magnetic storage?
-Slow access, very big ,fragile.
Properties of optical storage?
-Easily damaged ,fairly portable ,cannot store a lot on it.
