108
Appendix E. An Introduction to Disk Partitions
As Figure E 5, shows, the partition table is divided into four sections. Each section can hold the
information necessary to define a single partition, meaning that the partition table can define no more
than four partitions.
Each partition table entry contains several important characteristics of the partition:
The points on the disk where the partition starts and ends
Whether the partition is "active"
The partition's type
Let us take a closer look at each of these characteristics. The starting and ending points actually define
the partition's size and location on the disk. The "active" flag is used by some operating systems' boot
loaders. In other words, the operating system in the partition that is marked "active" will be booted.
The partition's type can be a bit confusing. The type is a number that identifies the partition's antic 
ipated usage. If that statement sounds a bit vague, that is because the meaning of the partition type
is a bit vague. Some operating systems use the partition type to denote a specific file system type, to
flag the partition as being associated with a particular operating system, to indicate that the partition
contains a bootable operating system, or some combination of the three.
Table E 1, contains a listing of some popular (and obscure) partition types, along with their numeric
values.
Partition Type
Value
Partition Type
Value
Empty
00
Novell Netware 386
65
DOS 12 bit FAT
01
PIC/IX
75
XENIX root
02
Old MINIX
80
XENIX usr
03
Linux/MINUX
81
DOS 16 bit
=32M
04
Linux swap
82
Extended
05
Linux native
83
DOS 16 bit
=32
06
Linux extended
85
OS/2 HPFS
07
Amoeba
93
AIX
08
Amoeba BBT
94
AIX bootable
09
BSD/386
a5
OS/2 Boot Manager
0a
OpenBSD
a6
Win95 FAT32
0b
NEXTSTEP
a7
Win95 FAT32 (LBA)
0c
BSDI fs
b7
Win95 FAT16 (LBA)
0e
BSDI swap
b8
Win95 Extended (LBA)
0f
Syrinx
c7
Venix 80286
40
CP/M
db
Novell
51
DOS access
e1
Microport
52
DOS R/O
e3
GNU HURD
63
DOS secondary
f2
Novell Netware 286
64
BBT
ff






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