Hard Drives in Miniature

For a decade, engineers raced to answer a strange question: how small can a hard disk get? This collection follows that race, gram by gram.

• HP Kittyhawk (1992) – a 1.3-inch, 21.4 MB marvel built for a PDA revolution that hadn't arrived yet. Its 42 MB successor could not save it; the Kittyhawk became one of computing's most instructive failures.

• IBM Microdrive (1999) – the idea reborn inside a CompactFlash card. From 340 MB to 1 GB, and under Hitachi's wing on to 4 GB and 6 GB, the spinning CF card powered early digital cameras and music players before flash memory caught up.

• Compact Vault 5GB – one of the late CF-format rivals that pushed micro hard disks to their capacity ceiling.

• Toshiba MK4001MTD (2004) – the 0.85-inch record holder, small enough for a phone and certified by Guinness as the smallest hard drive ever made.

• PC Card adapters – the unglamorous companions that let these tiny disks talk to ordinary laptops.

Flash memory ended the race soon after — silently, with no moving parts at all. What remains is some of the most exquisite mechanical engineering ever squeezed into a matchbook.