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- Logical Drive Letters
-
- Diskette drives A: and B: are always defined, even on a computer that only
- has one physical drive. That is why DISKCOPY can always do a copy from A: to
- B:.
-
- A drive letter, such as B:, that is defined even though there is not a
- physical drive to match it, is called a logical drive letter.
-
- The drive letters that DOS assigns from C: on are determined by the order in
- which internal drives or partitions on them (recognized by device drivers
- that are supplied with DOS) and DRIVPARM lines are encountered in the
- CONFIG.SYS file. Next, drive letters are assigned in the order in which
- DEVICE=DRIVER, DEVICE=RAMDISK, and DEVICE=VDISK lines are encountered in the
- CONFIG.SYS file. If you include two DRIVPARM lines for the same device index
- (/D:n), or two DEVICE=DRIVER lines for the same device index, that physical
- drive will have two logical drive letters. This is useful on a system with
- only one 3 ½" drive, since it provides a way to copy files between two
- diskettes using one physical drive. The COPY, DISKCOPY, and XCOPY commands
- can use logical drive letters advantageously.