Hardware Reference
In-Depth Information
23. If any boot indicator byte in the MBR partition table is invalid, or if more than one
indicates an active partition, the following message is displayed and the system stops:
Invalid partition table
24. If an active partition is found in the MBR, the partition boot record from the active
partition is loaded and tested.
25. Ifthepartitionbootrecordcan'tbereadsuccessfullyfromtheactivepartitionwithin
five retries because of read errors, the following message is displayed and the system
stops:
Error loading operating system
26. The hard disk's partition boot record is tested for a signature. If it does not contain a
valid signature of 55AAh as the last two bytes in the sector, the following message is
displayed and the system stops:
Missing operating system
27. The volume boot record is executed as a program. This program looks for and loads
the operating system kernel or system files. If the volume boot record can't find or
load the system files, or if a problem was encountered loading them, one of the fol-
lowing messages appears:
Non-System disk or disk error
Replace and strike any key when ready
Non-System disk or disk error
Replace and press any key when ready
Invalid system disk
Replace the disk, and then press any key
Disk Boot failure
Disk I/O Error
All these messages originate in the volume boot record (VBR) and relate to VBR or
system file problems.
Fromthispointforward,whathappensdependsonwhichoperatingsystemyouhave.The
operating system-dependent boot procedures are discussed in the next several sections.
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