The 0.85 inch (about 2.1 centimeters) drive, unveiled in January, has storage capacity of two to four gigabytes and is small enough to be used in mobile phones, digital camcorders and portable storage devices, Toshiba Corp. said in a statement.
The HDD, to be listed in the 2005 edition of the Guinness World Records book due out in September, will be mass-produced from late this year, it added.
Guinness' science and technology editor David Hawksett said in the statement that the world's first hard drive device, introduced in 1956, needed 50 two-foot (60 centimeters) disks to store 4.4 megabytes.
"I could soon hold more information in my watch than I could on my desktop computer, just a few years ago," he was quoted as saying.
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