ACRONIS TRUE IMAGE 8.0 User Manual page 74

Appendix B Hard disks and BIOS setup
Please note that
BIOS, AWARDBIOS and brand-name hardware manufacturers.
Several years ago, the operating system boot sequence was hard-coded into the
BIOS. An operating system could be booted either from a diskette (drive A:), or
from the hard disk C:. That was the sequence in which the BIOS queried external
drives: if drive A: was ready, BIOS attempted to boot an operating system from a
diskette. If the drive was not ready or there was no system area on diskette, BIOS
tried to boot an operating system from hard disk C:.
At present, BIOS allows booting operating systems not only from diskettes or hard
disks, but also from CD-ROMs, DVDs and other devices. If there are several hard
disks installed in your computer labeled as C:, D:, E:, and F:, you can adjust the
boot sequence so that an operating system is booted from, for example, disk E:. In
this case, you have to set the boot sequence to look like E:, CD-ROM:, A:, C:, D:.
This does not mean that booting is done from the first disk in this list; it only means that the
first attempt to boot an operating system is to boot it from this disk. There may be no
operating system on disk E:, or it can be inactive. In this case, BIOS queries the next drive in
the list. Errors can happen during the booting, see B.2.5 «Hard disk initialization errors».
The BIOS numbers disks according to the order in which they are connected to IDE
controllers (primary master, primary slave, secondary master, secondary slave);
next go the SCSI hard disks.
This order is broken if you change the boot sequence in BIOS setup. If, for
example, you specify that booting has to be done from hard disk E:, numbering
starts with the hard disk that would be the third in usual circumstances (it is usually
the secondary master).
After you have installed the hard disk in your computer and have configured it in
BIOS, one can say that the PC (or the motherboard) «knows» about its existence
and its main parameters. However, it is still not enough for an operating system to
work with the hard disk.
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management differs for various BIOS versions, e.g. for AMI
boot sequence
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