The MBR points to a specific sector on the drive where the PBFS is located, this is called a sector chain. The 92h error is generated when the sector the MBR points to does not contain the PBFS boot information resulting in the sector chain failing. This is due to something is moving or corrupting the PBFS such as a 3rd party defrag utility or something modifying the MBR, although this is far less likely. The PBFS is protected using the Safeboot.fs and Safeboot.rsv files located on the root of C:. These files cannot be moved either from the location in the directory of physically to different sectors on the disk or the 92h error will be displayed.
Note: EEPC 6.2 is end of life / end of support.
KB81538 - ePO 4.6.x extension upgrade path from Endpoint Encryption for PC 6.1 and 6.2 to Drive Encryption 7.1.x