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Appendix A Hard disks and BIOS setup
36
Copyright © Acronis, Inc., 2000–2004
Appendix B. Partitions and file systems
B.1 Hard disk partitions
The mechanism that allows you to install several operating systems on a single PC
or to carve up a single physical disk drive into multiple “logical” disk drives is called
partitioning.
Partitioning is performed by special applications. In MS-DOS and Windows, these
are FDISK and Disk Administrator.
Acronis offers a special application suite that will handle disk administration tasks. This
product is Acronis Disk Director Suite. It includes disk partitionin
g
, multibootin
g
, partition
recovery and other disk management applications.
Partitioning programs perform the following:
create a primary partition
create an extended partition that can be split into several logical disks
set an active partition (applied to a single primary partition only)
Information about partitions on a hard disk is stored in a special disk area – in the 1
st
sector
of cylinder 0, header 0, which is called the partition table. This sector is called the master boot
record, or MBR.
A physical hard disk mi
g
ht contain up to 4 partitions. This limit is forced by the partition table
that is suitable for 4 strings only. However, this does not mean you can have only 4 operatin
g
systems on your PC! Actually, existin
g
applications called disk mana
g
ers support far more
operating systems on disks. For example, Acronis OS Selector enables you to install up to 100
operating systems!
B.2 File systems
An operating system gives the user the ability to work with data by supporting some
type of file system on a partition.
All file systems are made of structures that are necessary to store and manage
data. These structures are usually composed of operating system boot sectors,
folders and files. File systems perform the following basic functions:
track occupied and free disk space (and bad sectors, if any)
support folders and file names
track physical location of files on disks
36


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