Hardware Reference
In-Depth Information
17.
If you are booting from a floppy disk and the first byte of the volume boot record is
lessthan06h,orifthefirstbyteisgreaterthanorequalto06handthefirstninewords
contain the same data pattern, this error message appears and the system stops:
602-Diskette Boot Record Error
18.
If the volume boot record can't find or load the system files, or if a problem was
encountered loading them, one of the following 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.
19.
If no boot record can be read from drive A: (such as when no disk is in the drive),
the BIOS then looks foran MBR at cylinder 0,head 0,sector 1(the first sector) ofthe
firstharddisk.Ifthissectorisfound,itisloadedintomemoryaddress0000:7C00and
tested for a signature.
20.
If the last two (signature) bytes of the MBR are not equal to 55AAh, software in-
terrupt 18h (Int 18h) is invoked on most systems. This causes the BIOS to display an
error message that can vary for different BIOS manufacturers, but which is often sim-
ilar to one of the following messages, depending on which BIOS you have:
AMI BIOS:
NO ROM BASIC - SYSTEM HALTED
Award BIOS:
DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER
Phoenix BIOS:
No boot device available -
strike F1 to retry boot, F2 for setup utility
or
