Technically, it's a 190.8GB array, or exactly 200GB in decimal measures. The "missing space" is the overhead of the Linux filesystem -- you know, on-disk structures for directories, file inodes, etc..

Hopefully the build process you have uses "-m0" as a flag to the "mke2fs" program, as otherwise it skims 5% off the top for "emergency" use -- a waste of space here and on most drives nowadays.

Cheers