There is an incorrect value in the Partition Boot Record (PBR) on thehard disk. Any computer with a mis-match in the number of read/writeheads reported by the Partition Boot Record and the system BIOS willlikely have this problem.

This error also occurs when the boot record signature of the masterboot record does not match a certain value at a certain location. Inthis case, the boot sector is invalid and the computer cannot boot.This error can also occur if there is no active partition defined inthe partition table.

The Hard Drive Mechanic Repairs this problem in just a few minutes.