बूट system

Boot Failure and Errors
Boot failure is the inability to locate the operating system from the storage drives. The most common reasons for boot failures are
1. A non bootable floppy in the diskette drive.
2. CMOS is not properly configured to boot from the correct device.
3. None of the devices in the CMOS are set to bootable.
4. Hardware failure.

Invalid Boot disk
The Master Boot Record (MBR) is created when the hard disk is partitioned. The MBR has master boot code, disk signature (or end of sector marker)) and a partition table for the disk. The MBR scans the partition table for the active partition and then finds the starting sector of the active partition. It then loads a copy of the boot sector from the active partition into memory and finally transfers control to the executable code in the boot sector. This means that the MBR identifies the operating system on the disk.
MBR can become corrupted due to human error, hardware problems, power fluctuations, virus attack, and other factors. An Invalid boot disk error is caused when the MBR is either corrupted or when it cannot find the partitions or the boot sector. Sometimes, it might pop an Invalid partition table or Error loading operating system or Missing operating system errors.
• Remove any floppy disks or CD-ROMs from the system & restart the system.
• Check if the Hard-disk drive is detected in the CMOS.
• Boot to the DOS prompt using a bootable floppy or CD. (Recovery Console in case of Windows XP/2000) & use the command FDISK /mbr or fixmbr.
• Reseat the Hard drive. If issue remains, replace the Hard disk dri


boot device
The error, inaccessible boot device stop error can be caused due to any of the following reasons.
• Corrupt Windows registry.
• Bad or partially connected data cables.
• Bad sectors on the hard drive.
• A boot sector virus.
• Upgrading the computer or Transferring of Hard drive from one computer to another.
• Power surge or outage.
Troubleshooting & Solution
• Try a repair or reinstallation of the operating system.
• Recreate the MBR using FDISK / mbr.
• Delete & recreate all partitions and format the drive to delete any possible viruses.
• Reseat the data cable to the hard drive, check by swapping the Hard disk drive cable with the CD-Rom drive cable.
• Replace the Hard Disk / Data cable.