Is there such thing as 500 MB
500 MB can mean two thing: 500 MEGA BYTES of main (system) memmory or 500 Mega bytes of storage (disk drive). One Megabyte is roughly the equivalent of one full novel.
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its not exactly 500megabytes, this is due to each value increasing by itself, eg 1,2,4,8,16,32,64,128,256,512.....etc.
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A byte is a unit of data storage. A megabyte is 1,000,000 bytes. And 500 megabytes is (of course) 500,000,000 bytes. Data storage comes in many forms (disk drives, memory (properly called RAM), flash memory like USB sticks, etc.) but the term 500 MB means the same thing either way. And yes, data storage that is equal to 500 MB is perfectly possible, the person who gave the second answer seems not to realize that multiples of two do not govern everything. RAM is usually retailed in such units (64 MB, 128 MB, 256 MB, etc.), but other methods of storage have no such constraints (like CDs that hold 700 MB, or floppy disks that hold 1.44 MB).
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Whoever gave the 3rd answer is forgetting that there is such thing as File System (FS) on mass Storage devices (such as CD's, DVD's, Harddrives, Floppy Disks etc) which take up space. EG if you get a 1GB Pendrive, it will have 0.99GB Space because the file system will take up the 0.01GB.
So if you are looking at 500MegaBytes of RAM, there is a different type of file system, which is NOT stored on the RAM sticks, which means you get the full 500MB. :-)
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Is this kid serious asking this question? Yes their is such thing as 500 mb. Some people should not be allowed to own a computer...