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Memory error while using write.csv

I've a 9 column data.frame (x) and it has millions of rows. I was able to read it into R, successfully do some modifications on it and the code would execute without a problem. However, when I try to write it out to a .csv file using


I get an error which says

Error: cannot allocate vector of size 1.2Gb

This makes no sense as the data is already in memory, the computations done, and all I want to do is write it out to disk. Also, while I monitored the memory, the virtual memory size almost doubled for this process during this write phase. Would writing a custom C function to write out this data.frame help? Any suggestions/help/pointers appreciated.

ps: I'm running all this in a 64 bit ubuntu box with about 24G RAM. Overall space may not be an issue. The data size is about 10G