Help with Dos write protect error

[Mark Tutt]

 bla> I am using MSC 5.1 and am trying to find a high level dos or possibly 
 bla> bios
 bla> call to determine the status of the disk drive.  In particular I am 
 bla> trying
 bla> to detect what the status of the write protect tab is.  My problem stems
 bla> from the fact that I get a write protect error Abort, Retry, Ignore? 
 bla> message
 bla> when I try to write to a file using fopen and fprintf.  I would like to 
 bla> detect the status before I write to the file so that dos doesn't have a 
 bla> chance to display it's error.  I have looked in many books and dos 
 bla> manuals
 bla> for bios calls with no luck.

What you are looking for is INT 13H Function 01H. It will return 03H in the AL 
register if the disk is write protected. However, what it returns is the info 
from the most recent disk operation, so you would have to call another disk 
function before calling this one. Perhaps INT 13 Function 00H, reset disk 
system would be the safest.

Hope this helps!

Mark



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