Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 44h Subfunction 08h
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     If a file is not found as expected on a particular drive, a
     program can use this subfunction to determine whether the user
     should be prompted to insert another disk.
 
     This subfunction may not be used for a network drive.
 
     Block drivers are not required to support Subfunction 08h. If this
     subfunction is requested and the block device cannot supply the
     information, control returns to the program with the carry flag
     set and error code 0001h (invalid function) in register AX.
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