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I'm looking for an editor that will open the file in chunks (not try to read the whole file into memory) as I'm trying to hand-edit a 200G file.

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Perhaps see the question: unix.stackexchange.com/questions/1279/how-can-i-edit-large-file – frabjous Jan 3 '11 at 6:21
up vote 7 down vote accepted

This may not be exactly what you're looking for, but hexedit will open large files like that. It only has what's displayed in the buffer (and maybe a little bit more) in memory. It's made for editing raw disk files (e.g., /dev/sda) and will display in hex side by side with ASCII or EBCDIC.

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