Unfortunately Hitachi was bought out by WD in 2012, though their products live on as HGST, a wholly owned subsidiary with their own brand/product lines. WD also sold off parts of Hitachi to Toshiba, with mixed product lines with varying reputations.
The best way to maintain data integrity is keeping redundant backups, so if that's your priority it may be better to buy 2 smaller drives from different manufacturers and keep them mirrored. For best security, you'd also want an off-site backup to guard against things like fire, flood, power surges etc.