Examples of external memory?
Flash drive, HDD with USB cable, any SD card
Internal memory on a computer is kept on the hard drive. The hard drive holds the memory for all things downloaded to the computer, and all web sites visited. External memory is usually kept on a device like a USB memory stick or a CD. External memory can be accessed by plugging it into the computer.
The major difference between main memory and auxiliary memory is that main memory is directly accessed by CPU but the auxiliary memory is not accessed by the CPU directly.For this the data is first transferred to main memory from auxiliary memory and then from main memory the data is transferred to the CPU for further processing. Some examples of auxiliary memory would be disks, external hard drives, USB drives, etc.
Internal is normally dedicated to the phone and it's OS. For such use as adding more apps, texts, contacts. External is more pointed at using it for your own personal media. although on smartphones you can point apps to be loaded from the external memory. other factors are if you can take the memory out of the phone. Internal meaing you can't and External meaning you can. This is normal in the format of a…
External Fragmentation: External Fragmentation happens when a dynamic memory allocation algorithm allocates some memory and a small piece is left over that cannot be effectively used. If too much external fragmentation occurs, the amount of usable memory is drastically reduced. Total memory space exists to satisfy a request, but it is not contiguous. Internal Fragmentation: Internal fragmentation is the space wasted inside of allocated memory blocks because of restriction on the allowed sizes of allocated…
External fragmentation is solved by any three methods:- 1.compaction:- attacks the problem of external fragmentation by moving all the allocated memory blocks into single unit by combining all free memory holes. 2.garbage collection:- it collects all the memory which is inaccessible and return them as a free memory. 3.paging:-breaking up physical memory into fixed size blocks and than filling these blocks by logical memory of same size.
in early, computer system has contiguous memory allocation,each process is allocated in a single contiguous(together) memory!!(allocating into memory addresses one by one,)it has tackled memory fragmentation(both internal and external). not allocating for a fixed size memory block.so no internal fragmentation, allocating contiguously ,so no external fragmentation!!!