Acer Altos 900 User Manual page 71

Selecting the "Auto" Option
If you do not know the exact type of your IDE fixed disk, select the option Auto.
During the power-on self-test (POST), when the system performs self-testing and
self-initialization before loading the operating system and applications, the BIOS
utility automatically determines your hard disk type. You can see the drive type
and its values when you enter the BIOS Utility.
Hard Disk 0 (xx MB) ... [Auto]
If desired, you can save the values under the option User.
Hard Disk 0 (xx MB) ... [User]
The next time you boot the system, the BIOS utility does not have to auto-
configure your hard disk as it detects the saved disk information during POST.
We recommend that you copy the IDE disk
drive values and keep them in a safe place in
case you have to reconfigure the disk in the
future.
Follow the same procedure to auto-configure other hard disks.
Selecting the "User" Option
There are cases when you cannot use the option Auto, instead you have to select
User. Choose the User option when you have installed an IDE fixed disk that
was previously formatted but does not use the disk native parameters or
Cylinder Head Sector
xx xx xx
Cylinder Head Sector
xx xx xx
Chapter 3 - BIOS Utility 3-7