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If you bought a 640 GB hard drive when the drive is formatted it will be slightly smaller then the size listed on the box. This is caused by a difference between the size of a GB as defined by windows versus the maker of the drive. The drive manufacture assumes that 1 GB is 1000 MB, where as windows assumes it is 1024 MB. If you carry these assumptions all the way down to the byte level you get: 640GB = 640000 MB = 6.4 * 10^8 KB = 6.4 * 10^11 bytes this is the base storage size of the drive. Then windows takes this number and does the same in reverse to get the number of GB is displays: 6.4 *10^11 bytes = 6.25 * 10^8 KB = 610351 MB = 596.1 GB There is nothing wrong with the drive, it's just a different unit of measurement.
i this is not original apple ipod... then how to find is it original or not may be ur question? here is the answer first when you buy the duplicate will also show 2 gb because some cheaters install other software for ipod and make it to show 2 gb but what actually is it s original memory will be 512 mb or 1 gb when you try to copy copy more than this capcity it will copy but after once again you cant get back that data stored in the exceeded space ... so error will come some thing like "the file is damaged" some thing like that then we will think may due to some error or due virus data is not available when we actually fully format it then only we will come to know it s duplicate... thats y now a days when we buy ipods we must buy original with bill... if there is a bill there will be warranty so.. now let s come to point if ur s is original then u just give for full format and then have look at the capacity... it occurs in original also some times due to bad sector formation.. so give for full format before giving full format just check for errors .. if it is original you will get back your real capacity back...