Solution:

The problem is caused by the incompatibility between the BIOS and CORNER HDD. After Updating the BIOS from POS-460 Version A1 to Version 2.20, the problem disappeared. The differences between the POS-460-S (POS-460 A1) BIOS and POS-460 A2 BIOS are: (1) The Award core: You can get the following message from the top screen while the system is booting up. POS-460-S BIOS: Copyright (C) 1984-1995, Award Software, Inc. POS-460 A2 BIOS: Copyright (C) 1984-1996, Award Software, Inc. The Award core BIOS of POS-460 A2 BIOS is newer than the Award core BIOS of the POS-460 S. (2) Boot ROM BIOS: If you want to remote boot into a LAN server (e.g. Windows NT server, Novell Netware server..etc), you need the Boot ROM BIOS. The Boot ROM BIOS of POS-460 A2 differs from the POS-460 S. The Boot ROM BIOS is a independent part in the system BIOS, like the VGA BIOS. (3) Support LS-120: The LS-120 is a floppy of new model which support high capacity floppy disk up to 120MB. The POS-460 A2 supports booting from the LS-120 floppy drive. It is an extra function and it is also an independent part in the system BIOS.