If four is what you want, four is what you get. To test something awhile back, I first split the HD into two partitions as evenly as the hardware would allow. I think one was .X larger than the other. Then I took each of the twin partitions and divided them in two as evenly as the hardware would allow (in this case, both new twins were listed as exactly the same size). There are numerous partition managers around, free and pay-for; I just happened to use Acronis Disk Director 12.