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Memory

1.2

QuestionAnswer
Properties of RAM Primary storage Faster to access than secondary storage Volatile Random access (to access one part is the same as any other) Expensive General Purpose Computers tend to have more RAM than ROM
Properties of ROM Fast, but expensive Tends to be small Read only - normally used for BIOS Non-volatile
Basic Input Output System (BIOS) Loads the operating system Checks for errors
Flash memory Non-volatile Short lifetime (can only be re-written a certain amount of times before it degrades) Fast access Robust Based on EEPROM (Electrically Erasable Programmable Read-Only Memory)
Solid State Drives (SSD) often used in home computers because of their performance form of re-writable flash storage
Secure Digital (SD) cards extends the capacity of small devices provides high capacity for their physical size
Solutions to running out of memory Terminating processes Virtual memory (using secondary storage if it was RAM) Installing more RAM
Issues to terminating processes This is not always possible because we may need all the processes
Issues to virtual memory can have negative impacts on performance can have negative impacts on the health of Solid State Disks (SSDs) We might have limited space in secondary storage
Issues to installing more RAM RAM can be expensive We may only need more memory on a temporary basis
How virtual memory works Memory is split into pages which moves between RAM and secondary storage If a page is not being used, it’s moved to the secondary storage. For the HDD, it’s called a page file. This frees up RAM storage To reuse it, we place it in the RAM with swapping
Primary storage RAM ROM Cache
Created by: That cool NAMe
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