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CX = FFFFh AL = drive number (0=A, 1=B, etc) DS:BX -> disk write packet (see #02552)
Return:
CF clear if successful CF set on error AH = status (see #02547) AL = error code (same as passed to INT 24 in DI) may destroy all other registers except segment registers
Notes: Partition is potentially >32M (and requires this form of the call) if bit 1 of the device attribute word in the device driver is set. Original flags are left on stack, and must be removed by caller. This call bypasses the DOS filesystem, though DOS 5+ invalidates any disk buffers referencing sectors which are written with this call. For FAT32 drives (which may be up to 2TB in size), use INT 21/AX=7305h. Windows98 will display an error message and deliberately hang the system on attempted write to any hard disk if neither bit 7 of the Extended Drive Info byte nor bit 6 of "DOS_FLAG" (List-of-Lists+60h) is set
See Also:
INT 13/AH=03h - INT 25/CX=FFFFh - INT 26 - INT
Format of disk write packet:
Offset Size Description (Table 02552)
00h DWORD sector number
04h WORD number of sectors to read
06h DWORD transfer address
See Also:
#02548
Category:
DOS Kernel
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Int 26h
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D
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