Siemens SIMATIC Rack PC 840 V2 Operating Instructions Manual page 124

Detailed descriptions
16.5 BIOS Setup
Primary Master, Primary Slave, Secondary Master, Secondary Slave
The system jumps to the following submenu when you select this type of menu field:
Figure 16-6
"Type"
Field
Option
"Multi-
Sector
Transfers"
Option
"LBA Mode
Control"
16-26
Primary Master (Example)
The selectable parameters given here are generally stored on the corresponding IDE
drive. The 'Auto' setting in the 'Type' field means that these values are automatically
read from the drive and written to memory (Auto detect).
If Type is selected for a drive that cannot be detected, a time-out is triggered within
approximately 1 minute and the entries remain unchanged. It is a good idea to select
"Auto" for the interfaces which have a drive connected to them.
Select "User" if you want to define the hard disk drive. You also need to configure the
other options, for example, Cylinder, Heads, Sectors/Track, or other properties of the
hard disk drive.
Select "None" if you have not connected a disk drive. This setting reduces the system
waiting time.
The Multi-Sector Transfers field is used to define the number of sectors that are to be
transferred per interrupt. The value is dependant on the drive used and and should only
be set with the Type field set to "Auto".
Disabled
2,4,8,16 sectors
In LBA Mode Control field (enabled,disabled). When set to "Enabled" hard drive
capacities > 528 MB are supported. The value is dependant on the drive used and and
should only be set with the Type field set to "Auto".
Operating Instructions, Edition 05/2006, A5E00248055-04
SIMATIC Rack PC 840 V2