首先感谢楼上三位大侠做答！
我前面已经申明， autoexec.bat 文件绝无问题，且在硬盘为Fat32格式且已格式化状态下使用时，一切正常！
经过测试发现，只需将压缩包的压缩率减小一些，在“问题硬盘”上不能解压的问题就消失了！
一个实例：将win98se原版启动盘内的ebd.cab文件解压后重新压缩（增大压缩比率）后装回原启动盘内，进行测试就出现我在前面叙述的问题：仅在“问题硬盘”时发生无法解压现象！将压缩比率减小再试，则又一切恢复正常。
从上面的事例我们可以看到，似乎压缩文件的压缩率与硬盘存在某种“关系”，到底是何“关系”呢？还望大侠们指点迷津。
附上win98启动盘的autoexec.bat 及setramd.bat文件
autoexec.bat
---------------------
@ECHO OFF
set EXPAND=YES
SET DIRCMD=/O:N
set LglDrv=27 * 26 Z 25 Y 24 X 23 W 22 V 21 U 20 T 19 S 18 R 17 Q 16 P 15
set LglDrv=%LglDrv% O 14 N 13 M 12 L 11 K 10 J 9 I 8 H 7 G 6 F 5 E 4 D 3 C
cls
call setramd.bat %LglDrv%
set temp=c:\
set tmp=c:\
path=%RAMD%:\;a:\;%CDROM%:\
copy command.com %RAMD%:\ > NUL
set comspec=%RAMD%:\command.com
copy extract.exe %RAMD%:\ > NUL
copy readme.txt %RAMD%:\ > NUL
:ERROR
IF EXIST ebd.cab GOTO EXT
echo Please insert Windows 98 Startup Disk 2
echo.
pause
GOTO ERROR
:EXT
%RAMD%:\extract /y /e /l %RAMD%: ebd.cab > NUL
echo The diagnostic tools were successfully loaded to drive %RAMD%.
echo.
IF "%config%"=="NOCD" GOTO QUIT
IF "%config%"=="HELP" GOTO HELP
LH %ramd%:\MSCDEX.EXE /D:mscd001 /L:%CDROM%
echo.
GOTO QUIT
:HELP
cls
call help.bat
echo Your computer will now restart and the startup menu will appear.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
restart.com
GOTO QUIT
:QUIT
echo To get help, type HELP and press ENTER.
echo.
rem clean up environment variables
set CDROM=
set LglDrv=
--------------------------
setramd.bat
---------------------------
@echo off
set RAMD=
set CDROM=
echo.
echo Preparing to start your computer.
echo This may take a few minutes. Please wait...
echo.
a:\findramd
if errorlevel 255 goto no_ramdrive
if not errorlevel 3 goto no_ramdrive
goto do_shift
:loop
if errorlevel %1 goto no_shift
:do_shift
set cdrom=%2
shift
shift
if not %1*==* goto loop
goto no_ramdrive
:no_shift
set ramd=%2
if "%RAMD%"=="C" goto c_drive
goto success
:c_drive
echo Windows 98 has detected that drive C does not contain a valid FAT or
echo FAT32 partition. There are several possible causes.
echo.
echo 1. The drive may need to be partitioned. To create a partition on the drive,
echo run FDISK from the MS-DOS command prompt.
echo.
echo 2. You may be using third-party disk-partitioning software. If you are using
echo this type of software, remove the Emergency Boot Disk and restart your
echo computer. Then, follow the on-screen instructions to start your computer from
echo a floppy disk.
echo .
echo 3. Some viruses also cause your drive C to not register. You can use a virus
echo scanning program to check your computer for viruses.
echo.
goto success
:no_ramdrive
echo The Windows 98 startup disk could not create a temporary drive for the
echo diagnostic tools. This may be because this computer has less than the
echo minimum required extended memory.
echo.
:success
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