but you are correct we never got a message the she has finnished booting and it look like she was turn on and off and on ect.. or her power was connect then unconnected ect..
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MASS MEMORY UNITS
There are two mass memory units aboard each probe. Each is a coaxially mounted, reel-to-reel digital magnetic tape storage device for GPC software and probe systems data that can be written to or read from. The MMU tape is 602 feet long and 0.5 of an inch wide and has nine tracks (eight data tracks and one control track). Tape made for very low temperature. These tracks are divided into files and subfiles for finding particular locations.
Computing functions for all mission phases requires approximately 400,000 words of computer memory. The probes GPCs are loaded with different memory groups from the MMUs containing the desired program. In this way, software can be stored in MMUs and loaded into the GPCs when actually needed.
To fit the required software into the available GPC memory space, programs are subdivided into nine memory groups corre sponding to functions executed during specific phases. Thus, in addition to the central memory in the GPCs themselves, 340 million bytes of information can be stored in each of the two mass memory units. Critical programs and data are loaded in both MMUs and protected from erasure.
The principal function of the MMU, besides storing the basic software, is to store background formats for certain prodcedures and the checkpoints that are written periodically to save system data in case the systems management GPC fails.
MMU operations are controlled by logic and the read and write electronics that activate the proper tape heads (read or write/erase) and validate the data.
Each MMU interfaces with its mass memory data bus through multiplexer interface adapters, which function like the GPCs. Each mass memory data bus is connected to all five computers; however, each MMU is connected to only one mass memory data bus. All MMU operations are on an on-demand basis only.
The mass memory units are an advanced form of data storage that fills the gap between slow-access drives of high storage capacity and discs or drums with fast access but relatively low storage capacity.
A mass memory unit uses 20 watts of power in standby and 50 watts when the tape is moving. MMU 1 is located in lower center compartment, and MMU 2 is in upper rear compartment. Each unit is cooled by plates to the outside case. Each MMU is 7.6 inches high, 11.6 inches wide and 15 inches long and weighs 22 pounds.