Whats the difference between SkyHD and Sky+HD

Whats the difference between SkyHD and Sky+HD

A SkyHD digibox, like the DRX595, has no internal hard drive so has no recording ability.
(more http://www.satandpcguy.com/Site/receivers/skyhd_receiver_decoder_digibox_amstrad_1tb.php

A Sky+D box, like the DRX890, has an internal hard disk drive for recording.
(more http://www.satandpcguy.com/Site/receivers/skyhd_receiver_decoder_digibox_amstrad_drx595_spain.php