Toshiba MK4006GAH - Manual (Page 148)

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b) The host writes the command code to the Command register.
c) The drive sets the BSY bit .
d) When the drive has finished processing a sector (or block) of data, it clears the BSY bit and asserts INTRQ.
e) In response to the INTRQ, the host reads the Status register.
f) The drive negates INTRQ in response to the Status register being read
See each command description for error report protocol.