" For storage, customers can cram up to five SATA 3 7200 RPM HDDs at 3 TB a piece, totaling a massive 15 TB. They can also option for a SATA 3-connected SSD with up to 256 GB of storage"
You mean,
" For storage, customers can cram up to five SATA 3 7200 RPM HDDs at 4 TB a piece, totaling a massive 20 TB. They can also option for a SATA 3-connected SSD with up to 1000 GB of storage,"