You may know that if you disable non-existing IDE drives(device
manager -> ide/atapi controllers-> primary or secondary channel-
This is good

But...

Maybe it's a bug or not, but this tweak only effects on master (device
0) devices if they're not installed.

If you have not installed a slave (device 1) device on any IDE channel
and its "device type" is set to "auto detect", changing this to "none"
doesn't help/effect on improving XP startup boot time for slave
(device 1) drives.

You can try and see.

On Dec 20 2007, 6:08 pm, kimiraikkonen <kimiraikkone...@gmail.com>
wrote:
It seems nobody is aware of this. I don't know if it's a bug or not
but this speed up recommendation has only effect on if you disable a
non-existing IDE "master" device, no matter you have "slave" device on
either channel.