Digital Equipment STARION 20 Series, Service Maintenance Manual

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Utilities & Configuration Digital STARION 9xx & 20xx PC
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Hard Disk Options (IDE Adapter 0/1 Master/Slave)
(continued)
Menu Fields Settings Comments
Multi-sector
transfers 2 sectors
4 sectors
8 sectors
16 sectors
Auto
Disabled Determines the number of sectors per block for multiple sector
transfers.
Auto refers to the size the disk returns when queried.
LBA control
mode Disabled
Enabled Enabling LBA causes logical block addressing to be used instead of
cylinders, headsand sectors.
32 Bit I/O Enabled
Disabled Enables or disables 32-Bit data transfer with the IDE HDD. If
enabled, Read Ahead Mode is also enabled and cannot be changed by
the user.
Transfer
Mode Standard
Fast PIO1
Fast PIO2
Fast PIO3 Selects the method to transfer data to and from the HDD. If autotype
is used to identify the HDD, Setup automatically selects the optimum
transfer mode.
Read Ahead
Mode Enabled
Disabled When enabled, the read ahead buffer in the local bus IDE controller
increases HDD performance. Enabled is selected automatically if 32-
Bit I/O is enabled.
Memory and Cache
Menu Fields Settings Comments
Internal cache Enabled
Disabled
Enables or disables the computer's internal cache.
External
cache
Enabled
Disabled External cache is not present or upgradeable on Starion 200i/300i
systems.
System BIOS
shadow Not user
selectable,
permanently set
to Enabled. The main logic board reserves an area of DRAM, called "shadow
memory" for a copy of system BIOS ROM. This DRAM is write-
protected and has the same addresses as the system BIOS ROM
locations. When system BIOS ROM is shadowed, the ROM
information is copied into an appropriate area in DRAM. This
increases the computer's performance because the system BIOS
instructions are in fast DRAM instead of ROM.
Cache system
BIOS Enabled
Disabled This option enables the system BIOS to be cached in the internal
cache and external cache (if installed). This increases computer
performance because BIOS instructions can be executed in cache
instead of RAM.