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- OSINBMG - BOOT MANAGER INFORMATION AND OVERVIEW, 2.X, WARP
- 12/20/94
-
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- BOOT MANAGER INFORMATION AND OVERVIEW, 2.X, WARP
- ================================================================
-
- Please Read Entire Dcoument 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.
-
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- 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.
-