1992	HP Kittyhawk
	First failure of disk drive form factor to evolve to a smaller size

Why its important
Historically, as drive form factors (sizes) evolved from 24" (RAMAC) to 3.5" (e.g., Conner CP340), each new generation of form factor achieved substantially higher unit volumes and industry revenues than the previous generation, albeit at a lower cost per box. The evolution slowed with the 2.5" form factor which as of 2010 has not yet achieved any of these benchmarks [2011iSuppli] and ended with the HP Kittyhawk, an unsuccessful form factor.

Discussion
In 1992 HP introduced the 1.3" Kittyhawk disk drive, the firstdisk drive of this form factor.The drive featured a number of unique technologies, including a built-in accelerometer that protected the hard drive from falls. Kittyhawk was claimed to be able to survive a 3-foot drop onto concrete while operating without loss of data.