Avago Technologies LSI20160 - Manual (Page 148)

6-22 DOS Device Driver Installation
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Make sure sufficient drive letters are specified (through the MS-DOS
lastdrive= command) to include the CD-ROM. A CD-ROM that
uses multiple disks requires a letter for each disk.
6.5.6 Assigning Drive Letters
This section provides important additional information for DOS users.
Please note that the MS-DOS operating system assigns drive letters to
primary partitions first. After the primary partitions have been assigned
drive letters, the logical partitions are assigned drive letters. Do not
assume that the drive letter designations will follow consecutively from
device to device within a PC system.
An Example:
A system is configured with an IDE hard disk as the boot drive, a SCSI
hard disk, and a CD-ROM drive. The IDE drive has three partitions: one
primary and two logical. The SCSI hard disk has two partitions: one
primary and one logical. The SCSI hard disk is assigned ID 1, and the
CD-ROM is ID 4. The distribution of the drive letters is:
A: 3 1/2” floppy drive
B: 5 1/4” floppy drive
C: IDE primary partition
D: SCSI primary partition
E: IDE first logical partition
F: IDE second logical partition
G: SCSI logical partition
H: CD-ROM