Converting Drive Letters to MS-DOS INT 13H Disk Drive Numbers (62571)
The information in this article applies to:
• Microsoft MS-DOS operating system 3.1
• Microsoft MS-DOS operating system 3.2
• Microsoft MS-DOS operating system 3.21
• Microsoft MS-DOS operating system 3.3
• Microsoft MS-DOS operating system 3.3a
• Microsoft MS-DOS operating system 4.0
• Microsoft MS-DOS operating system 4.01
• Microsoft MS-DOS operating system 5.0
• Microsoft MS-DOS operating system 5.0a
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.21
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q62571
SUMMARY
The BIOS Interrupt 13H uses a zero-based number for floppy disk drives
("A"= 0, "B"= 1, and so on), and a zero-based number with the high bit (bit
7) set for hard disks ("C"= 80H, "D"= 81H, and so on).
Modification Type: |
Major |
Last Reviewed: |
5/12/2003 |
Keywords: |
KB62571 |
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