IBM Aptiva Hardware Maintenance Manual page 39

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IDE Primary Channel Master is attached to IDE connector 1 on the
system board and set as the master device. This is the hard disk
that comes preinstalled with your computer.
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IDE Primary Channel Slave (if installed) is attached to IDE
connector 1 on the system board and set as the slave device.
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IDE Secondary Channel Master (if installed) is attached to IDE
connector 2 on the system board and set as the master device.
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IDE Secondary Channel Slave (if installed) is attached to IDE
connector 2 on the system board and set as the slave device.
Normally, a preinstalled CD-ROM drive is connected here.
NOTE: The CD-ROM drive information does not appear among these
options. Click on the System Information option in the Setup main
menu to verify the presence of a CD-ROM drive.
The following section contains the details on the parameters under each IDE
drive submenu.
Type
This item specifies the number of cylinders, heads, and sectors, and the size
of a particular IDE drive. If no information appears opposite the parameters,
there is no drive installed in that channel.
Hard Disk Block Mode
This function enhances disk performance depending on the hard disk in use.
BIOS automatically detects if your hard disk supports this feature.
Setting to Auto allows data transfer in blocks (multiple sectors) to increase the
data transfer rate. If your system does not boot after setting this parameter to
Auto, change the setting to Disabled. The default setting for this parameter is
Auto.
Advanced PIO Mode
The advanced PIO mode feature improves system performance by allowing
the use of faster hard disk drives. If your hard disk supports this feature, you
may set this parameter to Auto (default), Mode 0, Mode 1, Mode 2, Mode 3, or
Mode 4 depending on the hard disk requirements. See the documentation that
came with the hard disk.
If your hard disk does not support this function, set this parameter to Disabled.
Hard Disk Size > 504MB
This enhanced IDE feature works only under DOS and Windows
environments. If set to Auto, which is the default, BIOS allows you to use a
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