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I think some information is missing here.
If /dev/sda is ~5GB, then /dev/sda1 contains all of them according to fdisk?
Also df shows that sda1 has ~2G. Where are the missing 3G?
Result of fdisk and df is below.
Disk /dev/sda: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 261 2096451 83 Linux
To elorabate on stress_junkie's post sda1 is only 262 out of a total 652 so the entire device is not being used. The missing space is unallocated. You can use gparted to resize the partition but make sure it is unmounted first.