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IBM last week set a new record for the number of bits of information that can
be squeezed onto a hard disc drive. Researchers at IBM鈥檚 Almaden Research Center
in San Jose, California, say they have created a drive with a density of 3
gigabits per square centimetre (20 gigabits per square inch) of disc
space鈥攖hree times that of the best commercial disc drives available today.
The drive uses a low-noise cobalt alloy magnetic material and has especially
sensitive heads to read and write the data. The discs, which will be on the
market within three years, can store two hours of digital video in one square
inch.