RAM (Random Access Memory):
Definition
- A small scale size IC's memory chip used to store and access data in any order (i.e. in random order), so the name Random Access Memory.
Description
- Also called as temporary or volatile memory.
- Holds the program and data, which are currently processing.
- Data is lost as soon as computer is turned off or power failure.
- Data stored in this memory can be altered or changed.
Types of RAM
SRAM (Static RAM):
- Fast and has less access time.
- Consists of flip-flop using either transistor or MOS (Mosfet).
- For each bit it requires one flip-flop.
- Status of each bit remains as it is unless there is write operation or power is off.
- e.g. Cache memory.
- Advantages
Refreshing circuit is not required. - Disadvantages
Costly and low package density.
Requires more space.
DRAM (Dynamic RAM):
- Slower and higher access time
- Data is stored in the form of capacitors.
- Capacitors charges when data is 1 and doesn't charge if data is 0.
- Because of leakage current in capacitor, they need to be refreshed to hold the data in memory cells.
- Refreshing is the process in which the contents of each memory cell is read and written hundred times a second.
- This maintains the data of memory cells in capacitor.
- e.g. Main memory.
- Advantages
Cheaper than static RAM. - Disadvantages
Requires refreshing circuit.
Tip Box
Boost your RAM
Using pen drive as a ram, increases the cache memory of the system. In effect increases the throughput of the system.
You can find this type of software over the internet called as eboostr.
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