solution

Suppose during an asynchronous parallel SCSI data transfer someone removes a floppy disk from the drive that is the intended target of the transfer. How would the initiator know that the error has occurred during the phases:

• Bus-free

• Status

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• Selection

• Message

• Command

• Reselection

• Data

a) During which of the phases is it possible that good data may be written to the floppy if the data transfer is a “write” operation?

b) If the transfer is a “read,” at which point would the system have good data in the buffer? Would the system ever acknowledge this data?

 
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