The electro-magnetic disks, can be demagnetized, or contaminated. The tape can be stretched, folded, demagnetized, or contaminated. The CD's and DVD's can be scratched. The HD-ROM is made of metal so more durable. Seek-time seems to be the magic question, there are many numbers out there on how much faster one type seeks then others.
Tape drives are obviously the slowest since they require rewinding.
Among the rest seek-time is not specified. Versatility is the main equalizer among drives. DVD is currently only writable by the company, but removable. HD-ROM is writable by the user once only, and not removable. I haven't seen any bench-marks but the media claims are the holograms beat all of the other mediums in all four areas.