NEC PowerMate Pro150 Series Service Manual page 56

n
Extended CHS
imposed by the Standard CHS mode. It can be used with drives which are larger
than 528 MB, but does not support the LBA mode.
n
Auto Detected (default)
the optimal mode. the first choice is to utilize Logical Block mode if it is
supported by the drive. The second choice is to utilize Extended CHS mode in the
drive topology allows. If neither of the above two methods are possible, then
Standard CHS mode is used.
Different OS have different abilities regarding IDE translation Modes:
n
UNIX does not currently support either LBA or ECHS and must utilize the
Standard CHS method. UNIX can support drives large than 528 MB, but does so
in its own way.
n
OS/2 2.1 and OS/2 WARP
methods. Note that LBA support may require a switch setting on an OS/2 driver
in order to operate in the mode.
n
OS/2 2.0 and Novel Netware
methods, but not LBA.
n
DOS and Windows
"Fast 32-bit IDE" option of Windows is utilized, make sure to use the Standard
CHS setting only, unless a version of WDCDRV.386 is being used which
supports this advanced geometry.
You will get better performance not using "Fast 32-bit IDE" if using a drive which employs
Mode 3 PIO on the PCI interface, unless using a version of WDCDRV.386 which supports
these advanced modes.
Multiple Sector Setting
The Multiple Sector Setting field controls the number of sectors which are transferred by an
IDE drive per interrupt generated. the choices are as follows:
mode also overcomes the 528 MB maximum size limitations
allows the BIOS to examine the drive and determine
CAUTION: When set to Auto Detected the
BIOS will detect what the drive is capable of, not
the translation mechanism which was used to
format the drive.
If a drive is run in a mode other than the mode in
which it was partitioned and formatted,
unpredictable results may occur, including data
loss.
can support LBA, ECHS, or Standard CHS
can support either, ECHS or Standard CHS
can support LBA, ECHS, or Standard CHS methods. If the
Setup and Operation 2-19