The lowdown on hard drives

Facts and figures:

The first hard drive (RAMAC) _ delivered on Sept. 13, 1956 _ weighed 2,140 lbs and stored 5 megabytes of data.

Today, a video iPod weighs 5.5 ounces and holds up to 60 gigabytes.

In 1956, the RAMAC cost $50,000, or $10,000 per MB.

Today, a GB of storage on a 3.5-inch hard drive can cost less than 50 cents .

Source: San Francisco Chronicle research