▁Systems ▁including ▁intellectual ▁property ▁and ▁key ▁members ▁of ▁Pro St or ’ s ▁R D X ▁engineering ▁team . ▁ ▁R D X ▁is ▁intended ▁as ▁a ▁replacement ▁of ▁t ape ▁storage . ▁R D X ▁remov able ▁disk ▁technology ▁consists ▁of ▁port able ▁disk ▁cart rid ges ▁and ▁an ▁R D X ▁dock . ▁R D X ▁cart rid ges ▁are ▁shock - proof ▁ 2 . 5 - inch ▁Serial ▁A TA ▁hard ▁disk ▁drives ▁and ▁are ▁advert ised ▁to ▁sust ain ▁a ▁ ▁drop ▁onto ▁a ▁concrete ▁floor ▁and ▁to ▁offer ▁an ▁arch ival ▁lifetime ▁up ▁to ▁ 3 0 ▁years ▁and ▁transfer ▁up ▁to ▁ 6 5 0 GB / hr . ▁ ▁Hard ▁disk ▁cart rid ges ▁capac ities ▁are ▁ 3 2 0 ▁GB , ▁ 5 0 0 ▁GB , ▁ 1 ▁T B , ▁ 1 . 5 ▁T B , ▁ 2 ▁T B , ▁ 3 ▁T B , ▁ 4 ▁T B , ▁and ▁ 5 ▁T B . ▁Sol id - state ▁cart rid ges ' ▁capac ities ▁run ▁from ▁ 6 4 ▁GB ▁to ▁ 5 1 2 ▁GB ▁per ▁medium , ▁dou bling ▁each ▁increment ; ▁or ▁as ▁W ORM ▁media ▁from ▁ 3 2 0 ▁GB ▁to ▁ 1 ▁T B . ▁ ▁D ell ▁mark ets ▁ ▁R D X ▁cart rid ges ▁under ▁the ▁trade ▁name ▁R D 1 0 0 0 ; ▁a ▁te ard own ▁reve als ▁they ▁contain ▁a ▁standard ▁laptop ▁drive ▁en