That was simple. But to avoid this becoming the shortest Ask Leo! article ever, let me explain why.
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As you can probably guess by now, all memory is not created equal. Your
system memory typically resides on your computer’s motherboard, and uses a very
high speed interface to connect to your computer’s CPU. In fact, as fast as
that interface is, it’s still not as fast as we would like it (so true about so
many things), and most modern CPUs actually copy or “cache” blocks of memory
internally where they can access it even faster.
One of the characteristics of system memory is that when you remove power,
*poof*, the memory has lost whatever it contained. Time to reboot.
USB Memory Sticks, on the other hand, are expected to retain whatever you
put in them when the power is removed. Heck, they’re expected to retain their
memory when they’re completely removed from the computer. As a result they use
a different memory technology typically called “flash ram”, which does exactly
that. It’s called “flash” because the memory contents are loaded, and then a
special signal is sent that, in a sense, tells the memory to “remember this,
now”. It’s kind of like taking a picture with a flash on your camera … the
picture “remembers” the state of everything when the flash went off. Flash BIOS
is called that for the same reason – it’s just flash memory that contains your
The downside to flash RAM is that it’s slower. Reading flash memory is
slower, and writing to flash memory is MUCH slower. It works fine as a virtual
disk drive because our expectations for a disk’s speed are quite different than
what we expect for system memory.
In addition to the issue of the memory’s own speed, there’s also the USB
interface to consider. As fast as it is for other purposes, it, too, is
significantly slower than your system’s main memory.
So USB RAM sticks, memory sticks, key chain drives, geek sticks, whatever
you call them, are great for portable data storage. But increasing your
system’s memory is an entirely different proposition.