One byte is enough memory to store 1 letter – so to store the word ‘hello’, you need 5 bytes of memory.
To store an MP3 file, you’ll need on average 1Megabyte (1MB, or 1 000 KB, or 1 000 000 Bytes) per minute the song lasts – so for a song which lasts about 3’30″, you’ll need about 3.5MB. If you have 10 MP3s to save, you’ll need somewhere between 35 and 40MB
The average photo you take on your digital camera will take up between 500KB and 2MB (it all depends on the number of megapixels your camera is).
So if your pictures take up 2MB each, you’ll be able to backup around 500 with 1GB (1000MB)
Please note – these numbers are approximate, and, yes, we know there are 1024K in a M, and 1024M in a G and so on 
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