The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive (magnetic disk storage) for secondary storage. [1] The system was publicly announced on September 14, 1956, [2] [3] with test units already installed at the U.S. Navy and at private corporations. [2]

The IBM 305 RAMAC — or simply RAMAC — was the first computer to use a random-access disk drive. The progenitor of all hard disk drives created since, it made it possible for any computer user to quickly and easily store, access, alter and erase data …

On September 14, 1956, at IBM's Glendale Laboratory in Endicott, New York, IBM demonstrated the 305 RAMAC (Random Access Method of Accounting and Control) Magnetic Drum Data Processing Machine. The machine used a series of IBM 355 disk memory units .

IBM 305 RAMAC是第一台带有硬盘驱动器（HDD）的超级计算机，重量超过1吨，可存储5MB数据，相当于目前数码相机中闪存卡的百分之一。 IBM于1956年9月13日推出RAMAC，其字母代表“计算和控制的随机访问方法”，它使用…

The first 350 C disk file became a commercially available product on September 4, 1956, and was a key component of the IBM 305 RAMAC system, which also included a central processor, card reader and printer. (In its early development. The file itself was called the 305. It became the 350 when the 305 system was announced.)

2022年12月6日 · 1956 年，IBM 的 Reynold B. Johnson 带领研发团队发明了世界上第一块硬盘 IBM 305 RAMAC。 该驱动器约有两个冰箱大小，重达一吨，包含 50 个 24 英寸盘片，容量仅为 5MB，数据传输速度 10K / S。

2018年9月13日 · IBM 305 RAMAC是第一台带有硬盘驱动器（HDD）的超级计算机，重量超过1吨，可存储5MB数据，相当于目前数码相机中闪存卡的百分之一。 IBM于1956年9月13日推出RAMAC，其字母代表“计算和控制的随机访问方法”，它使用移动磁头HDD（磁盘存储）作为二级存储。 最早的305 RAMAC计算机系统可真正称得上是“庞然大物”，必须由叉车搬运并通过飞机运输，需要安放在面积大约9×15平方米的房间内。 单单350磁盘存储单元本身的面积就达1.5平方 …

2011年12月26日 · In September 1956, IBM launched the 305 RAMAC (Random Access Method of Accounting and Control), the first commercial computer that used a moving-head hard disk drive (as opposed to sequential access magnetic tape storage). The RAMAC's disk storage unit, the IBM 350, weighed over a ton, had to be moved around with forklifts, and was…

2013年1月10日 · From the bitsavers.org collection, a scanned-in computer-related document.ibm :: 305 ramac :: A26-3502-0 305 RAMAC Reference Manual 1958. Skip to main content. Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive ...

2024年4月2日 · IBM 350 Disk Storage Unit，作为IBM 305 RAMAC系统的存储核心，是世界上首个商用硬盘驱动器，它采用磁性存储原理实现数据的随机存取，虽体积庞大且容量有限（约5MB），但在当时使用流行的8bit编码系统而言，已经可以存储大量文本与记录，并通过并行接口 …