Sdružení přátel historických počítačů je dobrovolná zájmová organizace, jejímž cílem je popularizace výpočetní techniky a její historie mezi širokou veřejností a zachování historické výpočetní techniky pro budoucnost.

11.12.07

1956: 5MB pevný disk IBM

clipped from www.snopes.com

CAN YOU GUESS WHAT THIS IS?




Its a hard disk in 1956....


The Volume and Size of 5MB memory storage in 1956.


In September 1956 IBM launched the 305 RAMAC, the first computer with a hard disk drive (HDD). The HDD weighed over a ton and stored 5MB of data.

Makes you appreciate your 4 GB USB drive, doesn't it?

The 350 Disk Storage Unit consisted of the magnetic disk memory unit with its access mechanism, the electronic and pneumatic controls for the access mechanism, and a small air compressor. Assembled with covers, the 350 was 60 inches long, 68 inches high and 29 inches deep. It was configured with 50 magnetic disks containing 50,000 sectors, each of which held 100 alphanumeric characters, for a capacity of 5 million characters.

An IBM RAMAC 305 with a 350 disk storage unit leased for about $3,200 per month back in 1957. Over a thousand of the 305 systems (one of IBM's last vacuum tube units) were manufactured before production ended in 1961, and the 305 was withdrawn in 1969.
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