The 100% Incompressibe option will result in a 101% file, it's not even possible to do deduplication on that file. (I've checked with 7Zip)
I'll do another test and see of something has changed.
I expect you can do about 40-50MB/s on that 40GB drive using incompressible data, don't know what/if throttling would make it worse.
edit:
Here'se a few samples of the original vs the compressed file.
100perc.png
I'll do a few tests but it's looking as designed.
@Vapor
The 40GB should cost < $100.
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