From NAS-Central Zyxel Wiki
There are at least two versions of the NSA-310 'in the wild'. The rebranded TDC Homedisk, and the 'genuine' NSA-310. Yet another version was presented at CeBIT 2007, but I never found evidence that it has actually been sold. According to the GPL sources there are at least 3 different versions, the TDC, the OBM and the SGW.
|CPU||88F6281 A1 (DDR2) 1200MHz|
ARM926EJ-S rev 1 (v5l) 1200 BogoMIPS.
|Internal HDD||1x Internal SATA I/II connector|
|Other||1x eSata port|