Scandisk: Privileged Operation Error #2 or System Reboots (122671)

The information in this article applies to:
    Microsoft MS-DOS operating system 6.22

This article was previously published under Q122671


When you run Scandisk, one of the following problems occurs:
    EMM386.EXE privileged operation error #02 is displayed -or-

    Your machine reboots itself


This problem occurs because when Scandisk starts, it makes a single INT1Ah function call to the ROM BIOS. This problem occurs on the following computers:
    Canon models C-200 M-50 and C-200 M-55
    CompuAdd 386
    Computers using a Microsolutions Compaticard
    Positive computers
    Sharp models 6700, 6781, 6785, 6800, and 6881
    Some AEG Olympia 386SX Laptops
    Some older ACER machines
    Snap-on Intel 386 and Intel Above Board 2.0
    Texas Instruments (TI) TravelMate 2000
    Zeos 80386 with an AMI BIOS dated 09/15/89
NOTE: The above list may not be complete.


To work around this problem:
    Use a version of Scandisk from MS-DOS version 6.20 or 6.21. -or-

    Obtain an upgrade for the ROM BIOS.

    NOTE: A ROM BIOS upgrade may not correct this problem on all machines. Check with the manufacturer to determine whether the updated ROM BIOS can handle this INT1Ah


Microsoft has confirmed this to be a problem in MS-DOS 6.22. We are researching the problem and will post new information here in the Microsoft Knowledge Base as it becomes available.


INT 0x1A was chosen as the detection mechanism by which hardware- implemented MRCI servers can communicate with software. (NOTE: No hardware- implemented MRCI servers presently exist.) Microsoft has found that with some ROM BIOS chip sets, the stack becomes corrupted when this function call is processed. If EMM386.EXE is loaded, it catches the error with its error-handling capabilities and generates the privileged operation error #02. The products discussed here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Modification Type: Major Last Reviewed: 11/20/1999
Keywords: KB122671