What do you think of this fact?
In June 1956, IBM shipped something to a paper company in San Francisco that changed computing forever: the Model 350 disk storage unit, the first commercial hard disk drive. It was part of the IBM 305 RAMAC system, and it was a beast.
A fridge-sized storage monster
According to IBM, the whole apparatus was about the size of two kitchen refrigerators and weighed more than a ton. The Computer History Museum puts the drive unit at 5 feet high and 6 feet wide, and its one-ton-plus weight includes a separate air compressor the drive needed to run.
Inside, a stack of big magnetized aluminum disks spun at 1,200 rpm. A read/write arm floated over them on a cushion of air. Some IBM executives didn’t believe in the design and nicknamed it the „baloney slicer“.
And all that hardware stored 5 million characters. The Computer History Museum calculates that as about 3.75 megabytes, while IBM’s own history page says 5 to 10 megabytes. Either way, that’s less than many single songs you stream without thinking about it.
Why it was still a revolution
Before RAMAC, looking something up often meant running a stack of punched cards through a machine. The disk drive let a computer jump straight to any record. IBM says the team reached an access time of around 800 milliseconds, and the company marketed the whole idea as „miracle memory“.
The drive was leased for 750 dollars a month. Early customers included 3M, Pfizer and United Airlines, renting a one-ton box for a few megabytes.
Bonus fact: During the 1960 Winter Olympics in Squaw Valley, California, IBM staff ran a data center that helped process the scoring, and RAMAC was part of that story.
From one ton to your pocket
IBM’s history page cites Computerworld with a brutal comparison: storing 1 terabyte in the 1950s would have cost around 1 trillion dollars. Today, the same amount costs less than 50 dollars.
Your phone’s “storage full” warning suddenly feels a lot less dramatic. Its great-grandparent weighed a ton, needed a compressor and paid rent for a few megabytes.