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Appendix B: Troubleshooting112
If you are using DOS or Windows 3.x or are loading your CD-ROM drivers under DOS
with Windows 95/98:
1 Go to a DOS prompt.
2 Type EDIT C:\CONFIG.SYS.
Your CONFIG.SYS file opens in the DOS editor program. Look for this line:
LASTDRIVE=drive (where drive is any letter of the alphabet). Change drive to Z.
This allows the OS to assign all drive letters through Z.
3 If your CONFIG.SYS file does not contain the LASTDRIVE=drive statement, you
can add it by simply typing LASTDRIVE=Z.
4 Select File ➤ Exit.
5 When you are prompted to save the file, select Yes . You should be back to a C:\>
prompt.
6 Type EDIT C:\AUTOEXEC.BAT.
7 Your AUTOEXEC.BAT file opens in the DOS editor program. Look for a line that
includes the word “MSCDEX.” The /L:drive parameter (where drive is the drive
letter assigned to your CD-ROM before you made changes with PartitionMagic) may
appear at the end of this line. Change drive to Z. Because the OS assigns all other
available drive letters before assigning Z, this ensures that partition changes you
make in the future do not invalidate your CD-ROM drive letter. For more
information, type HELP MSCDEX at a DOS prompt.
If your computer is on a network, when you log in to the network, the letter “Z” and
other letters at the end of the alphabet may be assigned to network search drives. In
this case, assign your CD-ROM a letter immediately preceding the last letter used by
the network search drives.
8 Select File ➤ Exit.
9 When you are prompted to save the file, select Ye s.
10 When you see the DOS prompt (C:>), reboot your machine.
Using PartitionMagic With a SCSI Hard Disk
To use PartitionMagic on a SCSI hard disk, you must have a SCSI controller card that
supports software Interrupt 13. Most SCSI controller cards let you enable software
Interrupt 13 support in the BIOS through the card. If your SCSI controller card does not,
contact the manufacturer to determine if your adapter can support software Interrupt 13.
As a general rule, if you are able to use FDISK to partition the disk, you will also be able
to use PartitionMagic.