I have all Win7 updates on mine, and with install and some movie apps installed, only have 14GB used. I am using Home Premium though, Ultimate is a tad bigger. As long as you dont install all the language packages, the OS shouldnt be bigger then 16GB even for Ultimate.
All SSDs come overprovisioned, but doing more so helps the GC more.
http://thessdreview.com/ssd-guides/o...-its-solution/
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Over provisioning allows more data to be moved at one time which, not only enhances GC, but also reduces write amplification to the drive. Write amplification is a bit tricky of an explanation but it is the measure of how many bytes are actually written when requiring storage of a certain number of bytes. A ratio of 1:1 would be ideal but not a reality and a typical result would be an actual size of 40kb written for a typical 4kb file. In short, maximizing over provisioning and reducing write amplification increases the performance and lifespan of the drive. Over provisioning also provides for remapping of blocks should the bad blocks be discovered during wear leveling, which unlike a hard drive, does not reduce the end user capacity of the drive. The replaced blocks simply come from the over provisioning.
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Doesnt work for Sandforce drives though.