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OSINBMG - BOOT MANAGER INFORMATION AND OVERVIEW, 2.X, WARP
12/20/94
================================================================
BOOT MANAGER INFORMATION AND OVERVIEW, 2.X, WARP
================================================================
Please Read Entire Document for Full Explanation of Procedures
----------------------------------------------------------------
An Overview of the Boot Manager
If you are going to install multiple operating systems, you can
use the Boot Manager feature to manage selective startup systems.
From the Boot Manager startup menu, you can select which
operating system you want to use each time you start your system.
Use the FDISK utility program during the installation of OS/2 to
install the Boot Manager feature. FDISK is a program supplied
with OS/2 that can be used to manage such tasks as creating and
deleting the partitions on your hard disk. Partitions are
divisions you create on your hard disk to use as separate
storage areas.
The following is a brief list of the steps you follow to set up
your hard disk for multiple operating systems.
- Install Boot Manager in its own partition (1MB in size)
- Create partitions for any operating systems (including OS/2)
- Install other operating systems in partitions created for
them. If you want OS/2 to work with DOS and Windows, you
must install DOS and Windows first. Otherwise, most other
operating systemscan be installed after installing OS/2.
- Install the OS/2 operating system
Hard Disk Management
A hard disk can be partitioned in several different ways. For
example, your hard disk can have one partition that takes up the
entire hard disk. However, if you are going to install multiple
operating systems on your hard disk (with Boot Manager), you
MUST separate the hard disk into multiple partitions.
During installation for OS/2 2.X or Advanced Installation Method
for WARP, you are asked how you want your partitions set up. The
default choice is to set up one partition (if you are installing
on a hard disk with NO DATA) or to preserve the setup of an
existing hard disk. If you choose to specify your own partition,
the FDISK screen is displayed.
From the FDISK screen, you specify the number and type of
partitions that you want created. You can create primary
partitions, which are typically used for operating systems. You
can also create logical drives in an area of the hard disk that
is outside the primary partitions. This area is known as the
Extended Partition. The logical drives within the extended
partition are typically used to hold programs and data.
NOTE: If a partition is going to contain an operating system,
the system must be within the first 1024 cylinders.
Your hard disk can be separated into a maximum of four
partitions. You can have four primary partitions or three
primary partitions and the extended partition. If you are going
to install multiple operating systems on your hard disk, you
must create one primary partition to contain the programs that
manages the startup of multiple operating systems. This
partition is referred to as the BOOT MANAGER Partition.
After the Boot Manager partition is created, you can create up to
three additional primary partitions (to hold three operating
systems), as in the following example:
BOOT MANAGER
______________________
DOS 5.0
______________________
DOS 6.1
______________________
OS/2 WARP
An important aspect of primary partitions is the fact that, at
any moment in time, only one of the primary partitions is ACTIVE.
When a given primary partition is active, any other primary
partitions on the same physical disk cannot be accessed.
Therefore, the operating system in one primary partition cannot
access data in another primary partition on same physical disk.
Another way of subdividing your hard disk is to create logical
drives within an extended partition. Logical drives are
typically used to hold programs and data. However, you can also
install OS/2 WARP in a logical drive, as in the following
example:
BOOT MANAGER | = Primary Partition
_____________|
DOS 5.0 | = Primary Partition
_____________|
OS/2 2.1 | = Primary Partition
_____________|
OS/2 WARP | = Logical Drive |
_____________| |
DATA | |
_____________| = Logical Drive | = Extended Partition
DATA | |
_____________| = Logical Drive |
The extended partition takes the place of one of the primary
partitions on your hard disk. In other words, if you create
logical drives within an extended partition, your hard disk can
contain only three primary partitions.
NOTE: You MUST have one primary partition in addition to the
Boot Manager partition.
In the above example, notice that two logical drives have been
set aside for data. That data can be shared by all the operating
systems (provided the file system formats of the logical drives
are compatible with the operating systems).
All of the logical drives exist within one partition-the extended
partition. You don't explicitly create the extended partition.
The extended partition is created the first time you create a
logical (NON-PRIMARY) drive.
One of the differences between a logical drive and a primary
partition is that each logical drive is assigned a unique drive
letter. However, all primary partitions on a hard disk share the
same drive letter. (On the first hard disk in your system, the
primary partitions share drive C&colon.). This means that only one
primary partition on a hard disk can be accessed at one time.
NOTE: The Boot Manager partition is different from other
primary partitions as it is never assigned drive letter.
If you want OS/2 WARP to be able to access the data in the
partition of another operating system (for example, the DOS
partition), install OS/2 WARP in a logical drive.
Primary (Boot Manager) | = No Drive Letter
________________________|______
Primary (DOS 5.0) | |
| |
________________________| |=These partitions share C:
Primary (DOS 6.1) | | (Only one can be active)
________________________|______|
Logical Drive (OS/2 WARP)|
________________________| = D:
Logical Drive (Data) |
________________________| = E:
Logical Drive (Data) |
________________________| = F:
Notice the drive letter assignments in this illustration. The
operating system that is active when you start the system
performs a process known as DRIVE MAPPING, where partitions and
logical drives are assigned drive letters. All the primary
partitions are mapped first and logical drives within extended
partitions are assigned subsequent drive letters (up through Z).
IMPORTANT: Only one primary partition per hard disk can be
active at a time. So, only one primary partition is
actually assigned the letter C at any one time. The
other primary partitions are not mapped.
An operating system maps only thoses drives with a format type
that it supports. For example, DOS does not support the
installable file system (IFS) format such as High Performance
File System. Therefore, any partition or logical drive that is
formatted with IFS is not mapped by DOS and is not assigned a
drive letter.
This document is for information about the Boot Manager Feature.
If you desire more explicit information, please ask for the more
detailed documents as follows:
OS2BMOS - Installing Boot Manager, OS/2 WARP, and one
additional Operating System, or two additional
Operating Systems.
OS2BMWOR - Installing Boot Manager Without Repartitioning
the entire Hard Disk.
OS2MAPDR - Examples of Hard Drive Mapping with One Hard
Disk; Adding a second Hard Disk; or Mapping Two
Hard Disks.
----------------------------------------------------------------
IBM disclaims all warranties, whether express or implied,
including without limitation, warranties of fitness and
merchantability with respect to the information in this document.
By furnishing this document, IBM grants no licenses to any
related patents or copyrights.