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
• 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
• 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.
• 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
The products discussed here are manufactured by vendors independent of
Microsoft; we make no warranty, implied or otherwise, regarding these
products' performance or reliability.
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