DMA (Direct Memory Access)
DMA stands for “Direct Memory
Access” it is a method of transferring data from the computer’s random access
memory RAM to another part of the computer without processing it using the CPU
central processing unit. While most data that is I/O from the computer is
processed by (central processing unit) CPU, some data doesn’t require
processing, or can be processed by another device.
In these, direct memory access can
save processing time and is more efficient way to move data from the computer’s
memory to other devices. For instance, the sound card may need to access data
stored in the computer’s RAM, but since it can process the data itself, it may
use direct memory access to bypass the CPU.
The video cards that support direct
memory access can also access the system memory & process graphics without needing
the central processing unit.
The ultra DMA hard devices use
direct memory access to transfer the data faster than previous hard drives that
required data to first be run through the central processing unit.
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