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When filling the netbeans cache, netbeans should bring up a warning when the disk is low on space, e.g. 100 MB left or whatever, similar to the warning "slowness detected". That warning should mention the directory, and also point to the --cachedir option. Currently, netbeans just writes and writes and writes. (Because of this, I lost a lot of time after installing 7.4 and having forgotten about having moved the cache to a different drive in 7.3 and wondering why my C: partition suddenly had 0 bytes left)