Siemens SIMATIC PC 670 Equipment Manual page 96

Configuring the Computing Unit in BIOS Setup
Multi Sector Transfer field
In the box Multi Sector-Transfer the number of blocks (sectors) are defined that
will be transmitted with one interrupt. The value depends on the drive and
should be set only by setting the Type field to "Auto".
LBA Mode Control field
If the LBA Mode Control field (enabled,disabled) is set to 'Enabled', the system
supports hard disks with capacities greater than 528 Mbytes. The value
depends on the drive and should be set only by setting the Type field to "Auto".
32 Bit-IO
field
The box 32 Bit-IO defines the access type for the drive
Transfer Mode and Ultra DMA Mode fields
The settings in these fields define the interface's data transfer rate. The value
depends on the drive and should be set only by setting the Type field to "Auto".
Hit ESC to exit the submenu.
5-8
Disabled
2,4,8,16 sectors
Disabled 16-Bit access
Enabled 32-Bit access (default)
Panel PC 670 Computing Unit, Equipment Manual
Release 04/02