Hi,
정일영 wrote:
[...]
I am testing with two system SPEC.
system #1 is installed SCSI disk and
System #2 is S-ATA Disk.
In booting , Primary-master disk absent or non-ATA. No Disks
To use; driver NOT Loaded message is displayed.
I think that UDMA2 is not support SCSI Disk or S-ATA Disk. Isn’t it?
You are right, UDMA and UDMA2 are meant to work with ATA (IDE/EIDE) disk
drives only.
Below is Autoexec.bat and config.sys
- Autoexec.bat
@ECHO OFF
IF NOT ERRORLEVEL 1 GOTO 2NDBOOT
:1STBOOT
A:\CTMOUSE.EXE /P /W
GOTO EXIT
:2NDBOOT
A:\SHSUCDX.COM /D:SSCD000 /L:X
A:\lbacache 8192 TUNW
GOTO EXIT
:EXIT
- Config.sys
FILES=255
BUFFERS=40
LASTDRIVE=Z
STACKS=9,256
DEVICE=A:\HIMEM.EXE
DOS = HIGH,UMB
DEVICEHIGH = A:\UDMA2.SYS /O
DEVICE=A:\SSCDROM.SYS /D:SSCD000
SHELLHIGH=A:\COMMAND.COM /P
If this is your configuration, then you are not using custom device
drivers to access your non-ATA disks. I suppose it works because your
BIOS is able to handle theese kind of disks, making DOS believe they are
normal disk accessible through int 13H (in the past this was true
exclusively for ATA disks).
The problem could be that the BIOS support for SCSI and S-ATA disk is
poor, on the assumption that the BIOS will be used only at startup to
help the O.S. to boot, so only a few blocks are read and only once per
session.
DOS systems, instead, use the BIOS for *all* disk access, so you get
slow disks.
To know for sure that this is the problem you should try:
- With another O.S. (shuch as Linux or Windows), the disk should run
faster.
- With another DOS (such as MS-DOS or DR-DOS), the disk should run as
slow as with FreeDOS.
If the problem is confirmed you can try to use DOS drivers for thoose
disks, if they are available. This should speed up things a lot.
Let us know.
Ciao
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