When you use the SUBST command on a removable drive, you do not have access
to the substituted drive in Windows 95 (not even at an MS-DOS prompt within
Windows 95).
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The SUBST command fails in real mode and protected mode when used on
removable media controlled by non-INT13h controllers.
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The SUBST command is not supported on drives that are controlled by non-
INT13h controllers. You do have access to the removable drive, but you do
not have access to the substituted drive.
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