RS11 disk drive

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Manufacturer: Digital Equipment Corporation
Drive Controller(s): RF11 (UNIBUS)
Capacity: 524 KB
Transfer Rate: 125 KB/sec
Media: single nickel-cobalt plated surface with fixed heads

The RS-11 is a fixed-platter fixed-head disk drive that can store up to 524KB of data, addressable on 16 bit word boundaries (most other DEC disk drives of this era had 512 byte blocks). The drive used 128 fixed read/write heads and recorded data on a single nickel-cobalt plated surface. The data transfer rate was 125K bytes per second.

Its controller is the RF11