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I have a large file on an external hard drive (about 10 GB. Exactly 10,543,768 KB). On my Windows XP machine, my C drive is showing me that I have 19.7 GB free.

I drag the file to my desktop and get the error: Cannot copy some_file: There is not enough free disk space

What gives? How can I fix this?

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up vote 1 down vote accepted

Some older filesystems (used when formatting a partition on a hard disk) do not allow file sizes larger than 4 GB.

It is possible your C: disk partition is formatted using FAT32, (see disk properties in Windows explorer and other places)

If so, you may be able to convert it to NTFS

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