IBM Aptiva Hardware Maintenance Manual page 48

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Write Protect All Sectors. Disables the write function all sectors of
the diskette or hard disk drive.
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Write Protect Boot Sector. Disables the write function only on the
boot sector of the diskette or hard disk drive.
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Normal. Allows the diskette or hard disk drive to function normally.
This is the default setting.
Memory/Cache Options
The Memory/Cache Options menu allows you to configure the internal and
external caches. Enabling the cache parameters optimize system
performance.
Some older applications, however, may not run properly with the caches
enabled. Set the parameters to Disabled when you run these applications.
Disabling the caches will degrade system performance.
Internal Cache
This parameter enables or disables the internal cache memory. The default
setting is Enabled.
External Cache
This parameter enables or disables the external cache memory. The default
setting is Enabled.
Cache Scheme This item indicates the cache scheme of the external cache.
This is fixed to the setting Write Back and is non-configurable.
The Write Back cache scheme allows updates in the cache but not in the
memory when there is a write instruction. The memory is only updated when
there is inconsistency between the cache and the memory.
Maximum Cacheable Size This parameter indicates the maximum supported
cache memory size in the system.
Memory Parity Mode This parameter allows you to activate the Error Check
and Correct (ECC) feature. Select ECC to enable BIOS to detect and correct
data errors. Select Disabled if you do not wish to use this feature. The
default setting is Disabled.
PnP/PCI Options
The parameters in the PnP/PCI Options menu allow you to set the IRQ
assignments for your PCI devices.
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