You could soon be able to store much more on an MP3 player, digital camera or mobile phone.
Toshiba has developed a tiny hard drive which measures less than an inch across but can hold between two and four gigabytes of data.
The drive, about the size of a £1 coin, was announced at the Consumer Electronics Show in Las Vegas.
The hard drive has emerged as one of the key components in the push to bring computing technologies to the home.
Some video cameras and music players such as Apple"s iPod have taken advantage of the shrinking size of hard drives.