IBM Aptiva 2174 Hardware Maintenance Service page 48

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IDE Secondary Channel Slave (if installed) is attached to IDE connector 2
on the system board and is set as the slave device.
NOTE: The CD/DVD-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/DVD-ROM drive.
Proceed to the following for 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 On allows data transfer in blocks (multiple sectors) to increase the
data transfer rate. If your system does not boot after setting this parameter to
On, change the setting to Off. The default setting for this parameter is On.
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 Configured(default),
Mode 0, Mode 1, Mode 2, Mode 3, Mode 4 depending on the hard disk
requirements. See the documentation that came with the hard disk.
Hard Disk Size > 528MB This enhanced IDE feature works only under DOS
and Windows environments. If set to On, which is the default, BIOS allows you
to use a hard disk with a capacity of more than 528 MB. This is made possible
through the Logical Block Address (LBA) mode translation. You may be
required to set this parameter to Off if you use other operating systems.
To prevent data loss, set this parameter to On if you are using a hard disk with
more than 528 MB capacity that was previously configured through the LBA
mode. If you use a hard disk configured through the user-specific cylinder-
head-sector (CHS) mode, set this parameter to Off.
Hard Disk 32-bit Access Setting this parameter to Enabled improves system
performance by allowing the use of the 32-bit hard disk access. This enhanced
IDE feature only works under Windows 3.x, OS/2, Windows 95, Windows 98,
and Novell NetWare. If your software does not support this function, set this
parameter to Disabled. The default setting is Enabled.
DMA Transfer Mode Setting this DMA Transfer Mode parameter to Auto will
enhance performance by maximizing the data transfer rate for this drive. If this
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