LastDrive/LastDriveHigh

Used to designate the maximum number of drives (real and virtual) recognized by the operating system.

The LASTDRIVE command can only be invoked from Config.sys.

Syntax:

LASTDRIVEHIGH=x

x	A single letter (A to Z) representing the last valid drive that MS-DOS is to recognize. (Default is Z) Note: a trailing colon should not be included.

Notes:

1. Whatever letter is specified in a LASTDRIVE statement, all system drives along with any other drives specified in config.sys are automatically included. Thus, if a system has two hard drives (C: and D:)and a CD-ROM (E:), the line:
   LASTDRIVE=A
   would be interpreted as:
   LASTDRIVE=E

2. If the DOS command is used to manage the upper memory blocks (it usually is), the default values for LASTDRIVE are automatically loaded into the HMA. ie. the line
   LASTDRIVEHIGH=z
   is invoked without needing to be explicitly stated.

3. If an invalid character (such as a trailing colon) is included, the minimum number of drives (as outlined in Note 1) are included. No error message is displayed.