If you go SCSI (I recommend that)
You can also terminate the onboard IDE.
It's what I have done. No delay after that ;-)
You can build it yourself:
Get a 40-pin female IDE header and wire a 5K resistor between pins 3 and 39,
and between pins 5 and 39.
Pins 3 and 5 are the high-order IDE data bits. Pin 39 is the IDE LED
connection, which is tied high. This hack ties the two high-order IDE
data bits high, making the ROM immediately skip looking for a drive.
Plug the header onto the A4000 motherboard IDE connector, making sure it
is on correctly.
Here's one on ebay too:
IDE Killer on ebaygood luck