Features of RAM

Summary of the basic features of the Random access memory:

① Random Access

  The so-called "random access" means that when a message in memory is read or written, the time required is independent of where the piece of information resides. In contrast, when reading or writing sequential access (sequential access) to the information in a storage device, it takes time and location to have a relationship (such as tape).  ② volatile  RAM cannot retain data when power is turned off. If you need to save the data, you must write them to a long-term storage device (such as a hard disk). The biggest difference between RAM and ROM is that the data that is stored in RAM after a power outage automatically disappears, and the ROM does not.  ③ High access speed  modern random access memory is almost the fastest write and read in all access devices, and the latency is negligible compared to other storage devices involved in mechanical operation.  ④ need to refresh  the modern random access memory dependent on the capacitor to store the data. When the capacitor is fully charged, it represents 1 (binary), and the non-rechargeable representative is 0. As the capacitor is more or less leakage of the situation, if not special treatment, the data will gradually lost over time. Refresh refers to the periodic reading of the state of the capacitor, and then re-charge the capacitor in accordance with the original state, to compensate for the lost charge. The need for a refresh precisely explains the volatile nature of random access memory.  ⑤ sensitive to static electricity  as with other fine integrated circuits, random access memory is very sensitive to the electrostatic charge of the environment. Static electricity interferes with the charge of the capacitor in the memory, causing data loss and even burning the circuit. Therefore, before touching the random access memory, you should first touch the metal ground by hand.

Features of RAM