|-
| result byte 0 || colspan="8" | ST3: status register 3
|}
{| class="wikitable"
|+ Specify (03h)
|-
! !! D7 !! D6 !! D5 !! D4 !! D3 !! D2 !! D1 !! D0
|-
| command byte 0 || colspan="3" style="text-align: center;" | x || 0 || 0 || 0 || 1 || 1
|-
| command byte 1 || colspan="4" style="text-align: center;" | SRT || colspan="4" style="text-align: center;" | HUT
|-
| command byte 2 || colspan="7" style="text-align: center;" | HLT || ND
|}
*US = Unit select (drive select)
*HLT = Head Load Time = : 2 to 254ms in 2ms increments*HUT = Head Unload Time = : 16 to 240ms in 16ms increments*SRT = Step Rate Time = : 1 to 16ms in 1ms increments (F = 1ms, E = 2ms, etc.)
*ND = Non-DMA mode