That's typical of any filesystem. If you go out and buy, say a 45GB drive, the drive might be able to actually HOLD 45GB of data, but the filesystem you install on it (be it FAT, NTFS, EXT2) will have a certain amount of overhead. The more space you have on a drive, the more overhead is required. I think on my 60GB drives, only about 54GB or so of it is actual usuable space.

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