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PAGE_13.INF
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This page gives various information about the current drive, as given by
DOS.
LASTDRIVE is the letter typically given as the LASTDRIVE= command from
your CONFIG.SYS. The default is E, unless you have more than 5 drives
defined, including floppies (a single floppy counts as 2), hard drives
(each partition is one letter), special drivers (such as Stacker or
Diskreet), and RAMdisks. Specifying extra letters allows you to use the
SUBST command effectively.
Logical drives are real drives, those created by the SUBST command, and
those created by special drivers.
For the current drive, the drive type may not always be correct. There is
no standard way of telling if a drive is actually a RAMdisk or similar.
A door lock is used by high density drives to let DOS know if a floppy
has been removed. Some removable hard drives may also use this.
JOIN lets a drive act as if it was a subdirectory of another disk.
SUBST lets a subdirectory act as if it was a separate drive.
A cluster is what DOS uses to keep track of data on the disk. A cluster
consists of several actual sectors of data. A standard hard disk will have
4 sectors in each cluster (2K of data.)