INT 21,2E - Set/Reset Verify Switch
AH = 2E AL = 00 to set off = 01 to set verify on DH = 00 for DOS versions before 3.0 returns nothing - with the verify setting on, disk I/O is more secure but takes longer to complete - see INT 21,54
AH = 2E AL = 00 to set off = 01 to set verify on DH = 00 for DOS versions before 3.0 returns nothing - with the verify setting on, disk I/O is more secure but takes longer to complete - see INT 21,54