binary (which computers use) does not use these figures. a long time ago someone figured it would be easiest if they used the metric prefixes for the numbers that come close e.g. 1024 (2^10) bytes is one kilobyte.
manufacturers advertise one gigabyte as being 1,000,000,000 bytes. it is not. a gigabyte is 1024x1024x1024 bytes or 1,073,741,824 bytes. divide 20,000,000,000 by that number and i guarantee it will give you ~18gb
windows take up about 2 Gb to install.. that might be where it is.. also, 20Gb isint really 20Gb.. Usually the actaul storage space is less, just because of the math and how it works out. look for the little print. My USB hey is 490 not 512, the math works out fine tho..
yeah but the point is that they still sell it as a 20 gig or whatever and its a rip off which always ****es me off. like my 250 gig reads like 235 which really annoys me. should just say its a 235 gig drive or whatever.
himalya, basically what it is is that computers "see" 1000 as 1024. so 1kb is not 1000 bytes but 1024 bytes. one megabyte is 1024 kilobytes and so on. from that you can determine what the drive really is.