Inside, it is noted in the description. SAS port forwarding to 4 SATA prewired behind the racks, vertical USB port on the motherboard and another available SATA port on the motherboard (which works without activation in bios), 6 external USB ports and a port eSATA in back. Personally I put him 2x2To + 2x1To software raid10 (NAS as OMV), plus the original 250GB hard drive to delivery to a web server (still under OMV manages many things via plugins) and a 60GB SSD for the system itself. I will use the port to connect an eSATA disk (the 250GB) via an eSATA cable -> sata.
To talk about the BIOS, it is simple and uncluttered. I updated (01/10/2013), but it does not change in functionality, or I did not see what ca change. It manages the hardware raid 0, 1, 10, JBOD and RAID Ready.
The processor is not removable (welded to the CM) it is possible to mount the RAM to 8GB (2x4). For now I leave the original 23Go my NAS are not too greedy in RAM. In use, maybe I would edit my review to add more or less. For now, considering the price, nothing wrong with that server. And always the perfect Amazon delivery. I ordered 2 2TB HDD simultaneously (Seagate NAS series), they arrived in the same package, but very well packed in cardboard boxes of individual trapped in plastic supports.
