What is flash memory? What is flash memory?

Flash memory, also known as Flash, is a commonly used type of memory in routers. It is a read-write memory that can still be saved after the system restarts or shuts down. The current iOS (Router operating system) is stored in Flash.

In fact, if the flash capacity is large enough to hold more than one operating system, this can be useful for iOS upgrades. When you do not know whether the new version of iOS is stable, you can retain the old version of iOS after the upgrade, and when there is a problem can quickly return to the old version of the operating system, so as to avoid a long network failure.

Flash is a erasable, programmable Rom,flash containing iOS and micro code. It can be imagined as a PC's hard drive, but its speed is much faster. Routers can be upgraded to software by writing new versions and OS. A program in Flash that will not be lost when the system loses power.