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AH = 20h DL = drive number (00h,01h)
Return:
CF clear if successful AL = media type (see #00265) AH = 00h CF set on error AH = error code 01h invalid request 30h drive does not support media sense 31h no such drive / media not present 32h non-default media / drive does not support media type
Notes: This function is supported by the 1993/3/8 Compaq ROM BIOS, but only partially (AL is always 00h when successful) by the 1993/8/3 version. This function is also supported by some recent versions of the Phoenix 486 BIOS. This function does not seem to be supported by some Toshiba BIOSes (at least before 1995, maybe some laptops??? with 1.44 MB floppies), because S/DOS 1.0 contains code to bypass a call to this function, always assuming the drive would not support media sense.
See Also: AH=15h
(Table 00265) Values for Compaq/ATAPI diskette media type: 03h 720K (1M unformatted) 04h 1.44M (2M unformatted) 06h 2.88M (4M unformatted) 0Ch 360K 0Dh 1.2M 0Eh Toshiba 3mode 0Fh NEC 3mode (1024-byte sectors) 10h ATAPI Removable Media Device
Category: Vendor-specific BIOS Extensions - Int 13h - C
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