How large a volume can be expanded in Windows depends on the cluster size. The cluster size is set when in initial volume is set and can not be changed. Here are a couple of articles that discuss this.
Maximum NTFS Volume Expansion
How can I view the allocation unit size of a NTFS partition in Vista?
You have to set the new of megabytes for the expansion to one megabyte (1 MB) less that the theoretical maximum number.
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