It got pretty dull after that. PsychaSec, like most d.h.f. depots, wasn't much more than a gigantic set of air-conditioned warehouse shelves. We tramped through basement rooms cooled to the 7 to 11 degrees Celsius recommended by the makers of altered carbon, peered at racks of the big thirty-centimetre expanded format discs and admired the retrieval robots that ran on wide-gauge rails along the storage walls. 'It's a duplex system,' said Nyman proudly. 'Every client is stored on two separate discs in different parts of the building. Random code distribution, only the central processor can find them both and there's a lock on the system to prevent simultaneous access to both copies. To do any real damage, you'd have to break in and get past all the security systems twice.'